I was thinking of a youkai that ate other youkai, so yeah.....
Name: Mearii Gekkou
Age: 18, supposedly.
Appearance: At a height of 5'4 and with the slim, flat build of a young middle school girl, people usually think she's lying when Mearii says that she's already graduated high school. She looks younger that she is, but still gives off the impression that she could possibly look that young at the age of 18. With short, neck-length hair that shines like obsidian, her black eyes betray none of her inner emotions. Her hands, though delicate from the outside, are callused at certain points. An expert could tell that she has handled firearms for a long time.
Personality: Despite her stoic, empty expression, Mearii is a person who could be considered less 'cold' and more as being simply 'professional'. She's a serious, hard-working, studious person who rarely has the time to think about using her spare time for fun stuff. Generally, the only thing she spends her time on outside of work is reading history textbooks, mythology articles, and cleaning her guns. Such an image has become so integrated into her personality that she pretty much has to be forced to have fun in order to not feel guilty about wasting time. Smart in a 'never give up' way, Mearii is a person who is perfectly fine with spending hours on trial-and-error solution-finding instead of sleeping or eating or bathing. Perhaps, then, she could be considered a professional, shameless person.
Abilities: Mearii is an existence that is partway between human and youkai. A one-tail gumiho who had refrained from eating human flesh for over five years thus far, her supernatural powers have fallen to the extent where she has almost no powers outside of her ability to see other spirits, and where her 'charm' has simply been reduced to making her appear to be a presentable young girl, regardless of how long she hasn't showered. Doesn't prevent her from smelling odd though. With slightly sharper senses than the human race, Mearii is ultimately just slightly better than a human at smelling, seeing, hearing, and reacting. Makes her a good markswoman, if nothing else.
Dragunov Sniper Rifle – A gift from a friend of her's, the Dragunov Sniper Rifle is just a standard issue military weapon outside of a special enhancement. Like all her firearms, it's spelled to be able to effect supernatural beings, though this doubles the amount of time it takes to load and fire a bullet, due to the extra time it takes to enhance a bullet with supernatural properties. Annoyingly enough, due to the fact that it's a magical gun, it also takes mana for her to shoot. In her current state, Mearii can shoot three times before needing to feed.
M16A1 Assault Rifle – Something she bought from a black market in a certain city after doing a few jobs that she'd rather forget, the M16A1 is her 'mob-slaying' weapon, that is, the gun she brings if she expects a lot of youkai. Not commonly used, it shares the same enhancement as her Dragunov, but is much more fluid in exchange for lower supernatural damage. Generally, she can go through three full clips of ammo before running out of mana. More often though, she's inclined to use it as a club, because most jobs don't require killing.
Glock 17 Semi-Automatic Pistol – A police-issue weapon Mearii picked up some time ago, the Glock 17 is her favored weapon, the one she carries with her the most often, regardless of whether it gets her in trouble or not. Due to past incidents with the law, she has two enhancements on this weapon: one which makes it impossible to fire without mana being input, and another that imbues the bullets with supernatural energy. Of course, people still get suspicious when she tells them that it's a model gun, but at least she won't be jailed for weapon possession this way. Due to the extra enhancement, Mearii can shoot 18 bullets before running out.
Brief Backstory Once upon a time, Mearri Gekkou was a gumiho, a fox spirit with the capability of gaining more tails and power the more human livers she devoured. With only one-tail, she was weak, and was only able to feed on the elderly or the diseased, ending their lives and calling it a mercy. But it tasted bad, and it was a practice that disillusioned her from doing so. Instead, the gumiho chose to starve, slowly wasting away in her spiritual form as mana seeped away from her body. She most likely would have ceased to exist, if it wasn't for a chance encounter with a Russian girl by the name of Josephine. From that Russian magi, she learned that one could gain energy from eating other youkai as well, and that if one chose to stay in a corporeal, a physical form, one could even become independent of mana for existing, instead depending on physical food to sustain themselves. It was an interesting proposition, and the moment Mearii took a bite out of another youkai, the taste, compared to diseased livers, was simply divine.
Soon, she gained the reputation of being a 'cannibal', a youkai that ate other youkais, an existence scorned and despised. Her mana regenerated faster due to this new diet, but her strength grew at a much slower rate. She was under Josephine's wing for a long time afterwards, depending on her protection as that magi taught her how to fight use modern weaponry, for Mearii was a one-tail gumiho, with almost no supernatural ability at all. It was fine though, and many years later, Mearii left her friend's care, going off into the world to become an independent woman.
Part of that was related to joining a supernatural detective agency solely for the higher chances of encountering stronger youkai during cases. Encounters that will become feasts.