How they compare: Ai Enma (Hell Girl)

Urban legend tells of the Hell Girl, Ai Enma, the emotionless ghost girl who is the spirit of vengenance. Anyone can contract with the Hell Girl to send their most hated enemy to Hell but the price for damning someone to Hell is to consign one's own soul to Hell as well.

Ai was once a mostly girl living in ancient Japan. However she was ostracized and bullied for her creepyness and strange abilities. As such it was only fate that she was picked for the ancient ritual to the mountain gods; a sacrifice of a child to ensure the crops growth. Her parents and the boy she loved tried to protect her from this but as the crops refused to grow the other villagers forced them to relent and give her over for sacrifice.

As she died Ai's hatred of the cruelty and betrayal overwhelmed her and she rose as an onryo, destroying her entire village. The Lord of Hell arrived before revealing that in her hatred she had consigned herself and her loved ones to an eternity to Hell. To stop this from happening she would have become the spirit of vengeance on Earth.

Ai Enma befitting her new role was granted the powers of Hell. One of her most famous abilities is her fire manipulation. These fireballs can destroy a large building in one shot. Upon her resurrection as an Onryo, the fires of her hatred burned down her entire village, though this was not an immediate effect. She can also create dark energy blasts and can use telekinesis as channels for her powers, her telekinesis even being able to effortlessly destroy machines specifically designed to stop her. 

While not an effect of her direct attack potency her power can cause destruction on a much wider scale then this, for instance she can incite a volcano to erupt or reality warp a town.

While she does not need it in particular, her physical body is also fairly tough as it can tank her own fire attacks and lightning strikes. 

In terms of speed, Ai is fast enough to quickly travel anywhere in Japan she is needed. This is likely hypersonic to massively hypersonic depending on one's interpretation. She can teleport, including sending herself through dimensions either to the living world, to one of countless dark worlds, to Hell or to her personal dimension, the land of eternal twilight. 

As mentioned earlier, Ai no longer needs a body, being the spirit of vengeance. If her body is destroyed, she can simply create a new one or can possess a physical entity nearby. Her true self is non-corporeal. This also gives her a natural invisibility.

Ai Enma is very proficient on manipulating the soul or mind of her opponents. She can send her opponent's soul to Hell instantly inducing death, or physically affect it and her possession is specifically noted to control both the body and soul of whom she possesses.

Ai also has powerful mind manipulation, often mentally tormenting a vile client before sending them to Hell. She can induce insanity, or spread fear and hatred. She can create illusions or directly transmit images to the minds of her victim and can directly enter their mind to attack their mental body. She can show people the future to their untimely ends usually, or the past forcing them to relive their worst memories. 

Ai also has control of the bounds of space and time. She can stop time, choosing who she wants to be able continue to move while time is stopped. She can casually see the future and past at will. She can enter the minds of others and affect their memories, affecting the past itself by doing so, corrupting it to her will. 

Her spacetime manipulation leads to her most potent ability; her reality-warping and her dimension hax. Ai Enma can casually go through dimensions as mentioned above, but via any portal like a window or a flash of twilight Ai can send others through dimensions as well. Her dimensional bfr can even work on people that can normally escape dimensions. She has sent people to traditional hells of being eviscerated or being boiled alive, but more often sends people to ironic hells of their sins. She has sent people into dark copies of the world to die, trapped people inside a world that was a cruel science experiment or the circus of hell where skeletons hunt down people mercilessly. Her personal realm is called the realm of eternal twilight which is beyond the concepts of life and death, meaning nothing can ever live or die there, meaning while there she can not be killed and she can endless torture anyone there. 

Ai also has a few other assorted abilities from her reality-warping; she can cause a person to disappear outright, can affect spiritual entities or turn into a spiritual orb. She can also summon her minions to her at any time to serve her. She can seal people as she did to seal a man into a magazine or more often in other dimensions and was able to transmute a man's face into a void. She was also able to withstand attacks from the Lord of Hell which should scale to her own abilities. 

Ai is also quite intelligent. She is centuries old and has tricked the Lord of Hell, her master who lived since the beginning of Hell. She was able to accurately predict the future without seeing the future just by knowledge of the hatred of the human heart and what it would do. 

Ai has very few weaknesses. Her primary one is that she must take the soul she was hired to take or the Lord of Hell will strip of her powers and turn into a powerless human as well as consign her and her loved ones to Hell. While Ai's soul is stronger then most souls, erasing her soul will surely destroy her. She also doesn't have much in the way of physical feats or skill feats as she generally vastly overwhelms any opponent with her raw power and hax, with one quite notable exception.

Name: Ai Enma, Hell Girl

Origin: Hell Girl

Classification: Spirit of Vengeance

Powers and Abilities: Superhuman Physical Characteristics, Astral Being, can affect spiritual beings and turn into one, fire projection, energy projection, soul manipulation, mind manipulation, memory manipulation, illusions, can induce insanity, fear and hate, can induce death, can enter the minds of others, physical/astral possession, invisibility, teleportation (inter-dimensional), summoning, transmutation, existence erasure, sealing, time stop, time manipulation, space manipulation, dimension manipulation/bfr, regen (low-godly), can enter a dimension beyond life and death, can see the future and past, reality-warping, likely resistance to most of her abilities

Weaknesses: Has to damn target's soul to hell or she loses her powers, doesn't have many physical power or skill feats, soul erasure will kill her

Destructive Capacity: Building Level directly, higher overtime or indirectly

Range: At least town scale and inter-dimensional

Speed: Likely Massively Hypersonic

Durability: Building Level+

Stamina: Infinite (has no physical body to tire)

Standard Equipment: Curse Doll

Intelligence: Likely superhuman

So how would she do in other verses?

In Marvel Comics, Ai Enma would be a low level street tier chracter physically even if her flight speed is well enough to fight with most of the metahuman population. The problem would be ridiculous hax variety that would cause the verse immense trouble.

Ai's dimensional hax while very strong would not be too big, Marvel has advanced technology that can do really well against dimensional travel. The problem is everything else basically. Most mystics would get shut down by Ai and she has a resistance to hax and a variety of hax including instant death by soul bfr or complete time stop at will, somtehing which even most Heralds can't resist. Just one of her abilities; at will seeing into the future is a better version of the ability that was so strong in the verse, an accidental precog that it kicked off civil war 2. Ai would cause massive trouble in Marvel until basically a versatile Herald steps in and outside of them speedblitzing even most of them could get cought by Ai's hax. 

In DC Comics, Ai would have stats roughly equivalent to most city-scale champions like the Bat-Family even if her hax is ridcoulous comparatively. The verse would do somewhat better against her since they have a lot of magic-based heroes even at a low level though evne most of them would have severe difficulty fighting Ai.

This would be especially true if Ai attacked them from other dimensions which is somewhat hard to fight for most DC characters of this tier. Constantine would be able to take her out but most people that don't raw outstat her probably couldn't defeat her one on one. That said once you get in the tiers with the serious magical characters there's generally enough characters that can survive large amounts of mystical abilities and can fight beings like that to stop her.

In the Bayonetta-verse, Ai would fit in as an inter-dimensional invisible hellish force though she is vastly more versatile then anyone in the verse. In terms of power she would be about on par with principality tier angels and demons, scaling from 7th Rank Angel Irenic who can traverse the human world thousands of times in a day and the 8th Rank Angel Fidelity who can survive the bottom of the oceans.

Ai's time stop can be viewed as a stronger but less versatile form of witch time. She also has her own form of summoning. Ai would be a major threat to most things that can't blitz her and even some that would be able too, though any competent witch scaling from a rusty Bayonetta in Bayo 1 should be able to beat her since they can summon demons who can hit astral beings and are vastly above her in stats. That said as a summon she would be ridiculously broken, using abilities like dimensional bfr and future sight that have canonically been very powerful in verse. As such it would be a bit weird to place her as she could get one-shot and blitzed by most powerful characters but if they don't do so she can mess with the verse so extremely it's hard to find anyone she couldn't hypothetically stop.

In the Yu-Gi-Oh! verse Ai would be similar in power to top tier magicians though likely greater scaling off the High Priest of Darkness who could call lightning which Ai can tank and cause disruptions to the enviroment including a building. She would be faster but not able to blitz as the verse's fighters can react to lightning.

While Ai is much more versatile and potent in her haxes the most of the verse's fighters at this tier, they have much more experience in magical duels and FAR stronger summons. As such she would need to be careful and not get caught in a direct magic duel. The verse also has access to prana which is a form of spiritual existence erasure particles that could engulf the universe and would absolutely destroy Ai. The verse has other ways of hypothetically beating her, such as sealing and destiny manipulation though she has powers as well the verse has never seen such as entering a dimension beyond life and death. 

In the Ring-verse, Ai would be massively more powerful then almost any onryo in the entire series, most of whom are basically only as powerful as Ai's summons. There would be basically two relevant threats; Bunshinsaba and Sadako.

Sadako vs Ai would be a very interesting fight. The two have similar levels of power with Ai being perhaps a bit faster. The two share many of the same abilities including possession, mind manipulation, dimensional manipulation, their own personal dimension with it's own physics, insanity inducement, soul bfr/death hax and so on. The differences they do have suggest it would be a very interesting fight.