Massive Spoilers for PGSM, the Sailor Moon Live-Action Series.
Princess Sailor Moon is the twist antagonist and top tier of PGSM, an alternate version of the first arc of Sailor Moon overseen by Naoko Takeuchi. In this continuity while Usagi Tsukino is still the reincarnation of Princess Serenity, the two are treated as very different entities. Princess Serenity was a young Lunarian Princess who was sheltered and sweet, heir to the power of the legendary Silver Crystal. However when her lover, the Earth Prince Endymion was slain, Princess Serenity lost her control over her emotions and the power of the Silver Crystal destroyed all life on both the Earth and Moon.
Far in the future, her reincarnation Usagi Tsukino leads the Sailor Senshi against the ancient enemy Metaria. However on rare occasions the spirit of Princess Serenity possessed Usagi. Princess Serenity in this new time is full of despair thinking she and her love Endymion are fated to be ripped from each other over and over. Turning selfish and cold from it, she mostly uses her power to try and secure Endymion and doesn't care about humanity or the Earth.
But when she is forced to kill Metaria possessed Endymion it breaks the Princess entirely as her emotions go out of control and she threatens to destroy everyone again. Princess Sailor Moon is the hybrid form of the Princess Serenity form and the Sailor Moon form, with the minds of both Usagi Tsukino and the spirit of Princess melded. Princess Sailor Moon is fundamentally what if Sailor Moon herself was the villain, turning her love into the source of her antagonist power, having a mixture of both Usagi's emotional volatility and Princess Serenity's selfishness.
In terms of power, the fluctuations in Princess Serenity's emotions lifewiped the Earth turning it into a ruined desert, an energy which she and only she endured requiring continental levels of energy. Back in the Silver Millennium she lifewiped the Earth and the Moon from the Moon, which could require around 30 times the energy using inverse square law. This DID kill her however she was only Princess Serenity at the time and didn't have the added capability of her Sailor Senshi state. The Silver Crystal is also said to have the power to destroy the world which may suggest planetary levels of energy, though it's arguable if the statements are literal or merely destroying all life.
In terms of speed, Princess Sailor Moon's movement speed is fairly low relatively speaking. The Sailor Senshi are able to move as blurs across the city quickly, at what would clearly be subsonic speeds but that's about it. In terms of reaction speed Serenity along with most characters can react to Sailor Jupiter's lightning-based attacks including cloud to ground lightning, giving them MHS Reactions. Her fastest facet is her attack speed. Sailor Moon primarily attacks with light based attacks including literal reflected moon from the Moon, and in the Silver Millennium her power visually immediately enveloped the Earth from the Moon consistently her attack speed around or even surpassing that of the speed of light.
As a Sailor Senshi, Princess Sailor Moon has a lot of passive abilities. She can sense danger or the presence of youma on a city wide scale and can feel powerful energies around her. She can also break the fourth wall. She has enhanced superleaping and acrobatics as well as skill in combat and as Princess Sailor Moon can use Levitation and Teleportation at will. She can use Disguise Henshin to disguise herself as anyone she takes a picture of with her magical phone the Telestia S, gaining their skills including the superhuman abilities of an athlete. This ability is pretty easy to make into an NLF so it's important to recognize the Sailor Senshi never use this to copy the abilities of someone like Kunzite or Beryl despite their overwhelming power so it's unlikely they can just copy any power or the power level from someone much stronger then them, though they should be able to replicate basic capabilities of someone's species or type of being.
As a Sailor Senshi she has resistance to many types of abilities, especially mind manipulation. Various forms of mind manipulation are tried on the Sailor Senshi including memory erasure, mind control, sleep manipulation, etc. often on the scale of large numbers of people and the Sailor Senshi can resist. This is especially true for Princess Sailor Moon who has two minds within her, that of Usagi Tsukino and that of Princess Serenity. The Sailor Senshi also resisted the energy draining of the Metaria Youma who drained the energy from all of Tokyo, can tank corruption that can turn people into Youma, and are unaffected by being in space. I presume this would count as outside help but Usagi also has the unique power to return to life so long as her friends keep her in their memories, even being restored from the Silver Crystal itself shattering.
Princess Sailor Moon typically fights with light/energy attacks, specifically Lunar ones. She uses this to create an aura/energy bubble around her which she uses for offense, defense, and levitation. She can fire beams or even a danmaku of energy blasts at her opponent. She can also create barriers with her energy, imbue her weapons with energy or bind opponents in bindings of light. Princess Sailor Moon passively absorbs Lunar energy and when the Moon is prominent gets stronger. Her attacks have shown the ability to fight ghostly ethereal enemies like the Youma Morga suggesting she can hit intangible enemies.
Princess Sailor Moon also has summoning. When her heart was in despair, she summoned armies of youmas that swarmed the Earth to protect her, these Youma being individually threats to the City Level Guardian Senshi. However she mostly uses this to summon her weapons to her side, weapons she can restore at will. Her Tiara provides her a small passive healing factor and can be used both as a boomerang attack and to bind enemies. Her Crescent Moon Wand is used to direct her light energy as well as to heal and purify. It was able to purify a building of people at once, and somewhat restore the Guardian Senshi's powers and memories. But while Sailor Moon used these as Princess Sailor Moon her primary weapon is the Princess Sword/Harp, an item that changes with Usagi's emotional state. As a harp she uses it to play the song of her despair. As a blade she can use it both as a sword but also to absorb and reflect energy.
Of course her strongest weapon is the Silver Crystal, the source of her life and her powers. The Silver Crystal is the holy artifact of the Moon which Usagi is the rightful heir of and which no one but the Heir can use. The Silver Crystal grants Princess Sailor Moon telekinesis strong enough that even casual usage created an earthquake across all of Asia. From merely the despair of the original Princess Serenity, the Silver Crystal wiped away all life on Earth and the Moon. It is said to control the world and when Usagi sacrificed herself at the end of the series she was able to restore the Earth from being entirely devastated (Though her friends brought her back to life.) It's possible Princess Sailor Moon could use it for the same purposes the original Queen Serenity did, that being sealing away Metaria, and inducing the reincarnation of the Princess and her friends as humans on Earth. Princess Serenity was never stated to have mastered the Silver Crystal or anything, but the Silver Crystal responds primarily to the heart so if Princess Serenity was particularly emotionally overwhelmed, it's fairly reasonable she could do these as well.
Princess Sailor Moon's primary weakness is without question her emotional instability. Princess Serenity only takes over their body when Usagi is too overwhelmed and doesn't feel strong enough to go on. Princess Sailor Moon is torn between Princess Serentiy's vengeful despairing heart and Usagi's compassionate, emotionally volatile heart. Emotional Manipulation is the only thing that anyone in her own series can do against her.
Beyond that, Princess Serenity's power relies on the Silver Crystal and the Moon. If she is deprived of either, she loses most of her abilities.
Name: Princess Sailor Moon, Princess Serenity
Origin: Pretty Guardian Sailor Moon
Powers and Abilities: Superhuman Physical Capacities, Light/Energy Manipulation and Absorption, Empowerment (Lunar), Regen (Low by herself, Low-Godly with her friends), Unaffected by a Vacuum, Enhanced Senses, Fourth Wall Breaking, Disguise Henshin and Ability-Copying, Levitation/Telekinesis, Teleportation, Healing/Purification, Binding, Summoning, Can affect intangible enemies, Potentially Sealing and Reincarnation Inducement, Resistance to Mind Control, Memory Manipulation, and Sleep Manipulation, Resistance to Corruption, Resistance to Energy-Draining
Weaknesses: Emotional Instability, Relies on the Moon and the Silver Crystal for her Powers
Destructive Capacity: At Least Continental+, Potentially Planetary
Range: Hundreds of Thousands of Kilometers (Lifewiped the Earth from the Moon)
Speed: Subsonic Movement Speed, Massively Hypersonic Reaction Speed, Lightspeed Attack Speed
Durability: Continental
Stamina: Superhuman (Uses the energy of the Silver Crystal)
Standard Equipment: The Silver Crystal, Princess Sword/Harp, Tiara, Moon Crescent Wand
Intelligence: Average Intelligence for the most part, Clever Emotional Intelligence (Regularly demonstrates the ability to read the feelings of others even when they are hidden), C Tier Skill (Demonstrates Professional Tier Skill in Sword and Boomerang Combat as well as Acrobatics. She also demonstrates skill comparable to the Guardian Senshi are experienced Warriors)
So if the Princess' emotional rampage happened in other verses, how would they do? PGSM came out in 2003, so I wanted to compare it to the other biggest names in the Magical Girl Genre in the early 00s, 2001-2005 (not including series that just aren't a very interesting comparison)
In the Nanoha-verse, Princess Sailor Moon would almost exactly be a Lost Logia. She's from the Moon Kingdom rather than the Belkan Empire, but would be extraordinarily powerful entities from an ancient empire, using ancient and unstructured magic and a threat to a local dimensional world. Her power is quite similar to that of Lost Logia which regularly can wipe all life from a planet or destroy it outright. Her Power would be considered within the S Class with only the strongest TSAB Agents though she can only basically keep up with them and the fastest like Fate would be able to blitz her, basically an extremely powerful magic source but without combat training which is exactly what Princess Serenity is with the Silver Crystal. Even her armies of Youma would be equivalent to upper tier TSAB Agents at B Class, though below Officers at A Class.
In the first two series of Nanoha that are from the early 00s: Nanoha Classic and Nanoha As, Princess Sailor Moon would be roughly equivalent to one of the final bosses of their series, the dimensional witch Precia or the Tome of the Night Sky. A fight between her and one of them would probably be a very dramatic but even fight, with both having a lot of raw power and potent magical abilities. Conversely the TSAB Agents in the area along with local assistance from Nanoha/Fate the Wolkenritter may be able to stop her. It would be a similarly difficult mission similar to stopping Precia or the Tome of the Night Sky but while they don't have the raw attack potency to harm Princess Sailor Moon, antimagic bindings should be able to work if they get into close range or the TSAB superweapon the Arc-En-Ciel may be able to stop her though if she's not distracted when they try the latter, she could absorb and reflect it with the Princess Sword. Broadly speaking they have weapons they just need to distract her long enough to get into relatively close range or to hit her with it which is dangerous as her raw power output is enough to one-shot anyone there, particularly given the wide area of effect of her abilities. They also have the secret weapon of Nanoha's befriending powers which should disrupt Princess Serenity's emotions via befriending Usagi. Serenity can't copy most of the powers in the verse outside magical potential and mild psychic abilities as much of it is based in technology.
In the more modern periods of Nanoha Princess Sailor Moon would be strong but not quite so overpowering just due to more recent Nanoha series focusing more on the TSAB as a whole as opposed to local forces and having way way more forces. Princess Sailor Moon would be similar to Evil Vivio in StrikerS where she is exceedingly powerful as an antagonist but not so much that one of the Three Aces couldn't defeat her one on one. Nanoha would ironically do the worst as the Princess Sword can absorb and reflect the Starlight Breaker, though Nanoha could still potentially win via antimagic cage or befriending. Fate can also bind her but has the advantages of lightning style combat specializing in high speed movements fast enough that Princess Sailor Moon wouldn't be able to react. And Hayate while she wouldn't be able to blitz has the advantages of a highly versatile broken set of abilities that should give her the advantage even if Serenity still has much higher power.
In Tokyo Mew Mew, Princess Sailor Moon would be an immense existential threat to the verse. The Mew Mews are fairly comparable in stats to the PGSM Guardian Senshi and Princess Sailor Moon could summon armies of Youma that were relevant threats to them. If the Mew Mews tried to stop Princess Sailor Moon, they'd be at a large risk, their advantages being movement speed roughly twice the speed of Princess Sailor Moon's reaction speed and mew power may be able to revert Princess Sailor Moon to Normal Sailor Moon as Mew Power can restore things even on the astral plane. On the other hand Princess Sailor Moon has OVERWHELMINGLY higher power, area of effect, versatility, and hax.
Assuming the antagonists help which they would be inclined to, they may able to assist. The aliens had dimensional hax that Princess Sailor Moon has never shown resistance to. They can also turn Living Organisms into Chimera on a genetic level as it worked on enzymes. Princess Sailor Moon can return being turned into a youma which I would presume including genetic changes but it's not technically said. The Saint Rose Crusaders from A La Mode are also a bunch of psychics and while Princess Serenity's telekinesis, telepathy, and teleportation is superior to Happy Child, Sweet Juliet, and Blue Bayou, Royal Highness has brainwashing powerful enough to control all of Tokyo, a level of brainwashing PGSM Sailor Moon hasn't shown resistance to, though if he controls just the mind of Princess Serenity, Usagi's mind can break her out of it, similar to what happened when Princess Serenity forcibly took control of their shared body. That said Royal Highness could potentially create an opening for the Mew Mews to restore her.
Granted these are definitely are all desperate strategies. Princess Sailor Moon would mostly be an immense threat that would be almost impossible to stop. However if she fought against Deep Blue, she would be completely out of luck. Princess Sailor Moon can hypothetically get past his regen by killing all humanity, but Deep Blue can tank her attacks and even if she uses the Princess Sword to absorb and reflect the Song of Oblivion, he can tank his own Song of Oblivion. She could maybe seal him away, but that's pretty much her only win con. She could try to copy his abilities but she's never copied anything like Deep Blue before, wouldn't have knowledge on using his abilities, and she'd likely only be copying the abilities of the original inhabitants of Earth and would only really have the abilities of someone like Kish or Pie who Deep Blue could beat even in weaker Blue Knight form. Deep Blue meanwhile can kill her even if she can neutralize the Song of Oblivion via numerous forms of haxes, including superior dimensional hax to the aliens prior, purification powers without effort equal to Princess Sailor Moon's best, higher plane destruction etc.. The only real advantage is that Usagi and Serenity are closer than Masaya and Deep Blue, and the latter are prone to internally fighting more than the prior, with it being possible Princess Sailor Moon could take an opportunity to seal Deep Blue.
In the Uta Kata-verse, assuming you think the Djinn are comparable in power to each other, then Princess Sailor Moon's base power would be fairly similar to the Djinn which would include the Sun Djinn who granted Ichika "the power of the Sun" which produces continental levels of power every second as well as the Mirror Djinn which has the power to wipe out all humanity. Ichika and Saya were able to fly over the city at similar speed to the subsonic movement speeds of PGSM. Overall Princess Sailor Moon would have similar power to a Djinn. The Djinn are invisible to "normal people" but Sailor Moon definitely isn't, and even if they are ghostly to her she can sense powerful energies and fight ghostly enemies.
The main feature of the verse are the 12 Djinn, spirits representing the forces of nature. Most of their Elemental Powers would only be relevant to Princess Sailor Moon for raw potency. Hydrokinesis from the Sea and Rain Djinn, Pyrokinesis from the Fire Djinn, Aerokinesis from The Heaven and Wind Djinn, Geokinesis from the Earth Djinn, and Fulminokinesis from the Thunder Djinn would only be threatening in the extent that their raw power might cause physical injury to Serenity. However with her ability to teleport away from their attacks, passive healing factors, high durability and the fact that the Djinn have never fought anyone on their level and Princess Sailor Moon is a skilled warrior, even the group trying to attack at once wouldn't be super helpful. And the Moon Djinn would be actively helpful for Princess Sailor Moon who could absorb its power. There are some things that might be helpful. The Flower Djinn hypothetically could use poisons on Sailor Moon, though given that she can purify herself it would likely have to work instantly or not at all, plus she'd have to get through the Light Aura surrounding her. Outside the Moon Djinn and maybe the Heaven Djinn representing the Sky, Princess Sailor Moon destroying the surface of the Earth could wipe out the entire domain of these Djinn.
The last three Djinn are of more note. The Mirror Djinn has her scythe which can drain the life from someone and turn them to stone, though she'd have to get into close range and through Princess Sailor Moon's Light Aura. The Sun Djinn's domain is too large and too far for Princess Sailor Moon to devastate so it might last a while against her, though eventually she will gain the ability to seal him. Finally the Darkness Djinn, while its direct element is not helpful against the beacon of light Princess Serenity, does have soul manipulation which she has never shown resistance too. So overall if the verse does survive her it would almost certainly be these three that are the major factors, though she would be an existential threat and probably most times be too overwhelming. It doesn't help that the Djinn don't understand humanity and wouldn't be able to manipulate her emotions at all. Ichika and Manatsu don't really change this either, as Ichika's powers are just whatever powers the Djinn grant her which is just the above 12, and Manatsu's abilities are vague are not really established to be on the level of the Djinn or Princess Sailor Moon. Manatsu was screaming in agony holding back a normal tsunami from the Sea Djiin for instance when Princess Sailor Moon's telekinesis can create earthquakes across all of Asia.
In Sugar Sugar Rune, Princess Sailor Moon would do absolutely bizarrely. Against anyone but the God Tiers, Serenity would have ridiculously higher power to the point that her youma armies that are billions of times weaker than her are in turn thousands or more times stronger than most Witches as they mostly scale to building level feats compared to the Sailor Senshi doing things like storms or fighting the city threatening Metaria Youma. However, Witches can easily fly to the Dark Side of the Moon, the portal to the Magical World in a short time period making them all much faster than Serenity's reaction time, making the fight a bit like a fight between a human and a swarm of mosquitos if you ignore both sides of abilities. A fight between them is bizarre as they are both very outside the context of each other's normal wheelhouse.
Princess Serenity can even by accidentally lifewipe the Earth with an FTL energy surge strong and fast enough to kill everyone but the god tiers in one attack. She also a matter of course summons armies of youma that can overwhelm the planet, each one being tough enough to tank attacks. This would definitely be able to overwhelm the conventional Halloween Forces of Ghouls and Goblins, Skeletons and Pumpkins.These armies are definitely a problem as much of the verse's haxes don't work that well on large crowds save the Nihilist Spider's webs which can erase even a dimension large enough to encompass endless galaxies (though ironically Princess Sailor Moon wouldn't be at threat from due to her natural levitation and light aura keeping the webs away). The verse is full of weird haxes that Witches and Ogres use such as basic witch tricks like soul stealing and transmutation to more esoteric things like telepathic visions of the entire cosmos. But the verse's biggest trick is emotion manipulation, which is basically like putting Superman against a verse full of Kryptonite users, if the accidental muscle spasms of seeing Kryptonite could cause Superman to accidentally destroy the world. If Chocolate used her infamous scariness to defeat Princess Sailor Moon it'd very likely succeed as the one similarity between Serenity and Usagi is being easily scared, though she might accidentally destroy the world. If Rockin Robin used his infamous charm on her, it might pacify her but she might also go "Endymion-samaaaa ðŸ˜" and destroy the world in despair. That's why this would be such a bizarre matchup. Princess Sailor Moon can resist several types of common hax in the verse including memory manipulation (Witches erase memories when they steal hearts, but Sailor Moon resisted Zoisite's memory-erasing music) and arguably transmutation, but they do have plenty of tricks that would work such as Noir hearts stealing life energy, Vanilla sealing her in pictures, mandragoras being magical plants that kill anyone who hear their cry. That said the longer the fight goes on, the more likely Princess Sailor Moon is to go into an emotional nova that kills the verse, especially as emotional manipulation is so common in the verse. Broadly I think without the God Tiers the verse can probably stop her if they recognize the threat she presents and are ready to fight, but if caught unaware of who and what she is, it's unlikely.
Against any of the God Tiers on the level of the Seven Witches of Legend who created Magical World, Princess Sailor Moon would just be outclassed. They created Magical World, an entire dimension. Granted not many are around at the end of the series but the Magic Senate is implied to have power relative to one as a group and if Chocolate gets the Fire Crystal from Magical World again, she can rise to that level and stop Princess Sailor Moon.. probably. She'd have an overwhelming attack power advantage being universal vs maybe planetary. Princess Sailor Moon would still have haxes she can do, including telekinetically disarming her so it really depends on if Chocolate messes around.
In the Mermaid Melody verse, Princess Sailor Moon would have surprisingly normal stats. Most of the fighters in the verse scale to the Continental range from Sara accidentally destroying the Indian Ocean Mermaid Kingdom, Gaito threatening to flood the world, and Mikeru's dimension being large enough he planed to fuse it with the human world yet could be faded temporarily by Kaito's power. Her movement speed is not nearly as fast as them as they can quickly swim across the oceans of the world, though lightning from Mikeru is still treated as faster as them so Princess Sailor Moon should still be able to react. Even her Planetary Highball is comparable to Mikeru's Planetary Highball called a threat to the survival of the planet, and her attack speed is similar to the Panthalassa who attack with Light themselves. Her Youma are also at the power level of the Mermaid Form Princesses and the Suiyo, the first villain group.
Princess Sailor Moon would be a fairly normal antagonist in the context of Mermaid Melody, albeit one with a very different personality and motive than anyone in the series. In her Base Level of Calmness scaling off the Silver Crystal's Telekinesis creating a quake across Asia and withstanding her own power destroying the surface of the Earth, she would be fairly relative to most of the strong fighters in the verse including the Mermaid Princesses, The Winged Ones serving Mikeru, and the Black Beauty Sisters. Against the Winged Ones and the Black Beauty Sisters, Princess Sailor Moon would easily have the advantage due to far greater versatility, hax, and seriousness. The Mermaid Princesses obviously have their default attack against her, the Mermaid Song which uses emotional manipulation. This could hypothetically work on Princess Sailor Moon though she can protect it somewhat the way the villains do by drowning it out by her own song of despair, though this would likely only work against one Mermaid Princess at once, and would be drowned out by a chorus of multiple of their songs together. So much like the normal villains of the series, she'd be a large threat to a single Mermaid Princess, but would be defeated by multiple working together.
However her usual trait is the way her power rises from her emotional state, either 30x or millions of times stronger depending on if you use the planetary highball. Gaito's power in base was able to somewhat withstand the power of the Seven Mermaids, and was doubled twice, once by absorbing Kaito's power and once by his rod's power which gave the Black Beauty Sisters power superior to his base form, putting him at around 28 the prior level, meaning Princess Sailor Moon in a highly emotional state would be around the power level of Gaito at his Peak state and in her highball would be around the power level of Mikeru who is a similar planetary threat. In this state she would comparable to one of the top tiers: Aqua Regina and Aqua Regina Lucia, The Panthalassa Twins Gaito and Kaito, and Mikeru and the other Ancient Ones. While she lacks the hax level and control of most of her powers that they do, she could easily tip the balance of power in the verse against any of them, being a single character equal in general potency to the major villain of either arc Gaito or Mikeru, especially as she use her ability copying to copy the form of an Ancient One, with even Fodder Ancient Ones being extremely powerful.
