so your the shadow hashira and your backstory is the same as tanjiro you have a little sister thats a demon that never eats humans (she was 12 when she was turned and is 15 her name is sumiyoki now your 17 and became a slayer when you were 13 and became a hashira at 15) Shadow breathing relies on speed and is an agility based style with modern strength and good stealth the origin of the style dates back to one of michikatsu's trainees in the Golden age of demon slayers is deprived from Moon breathing and tries to end the fight before it even starts and your dating kanae( alive rengoku and kanae) your forms are shadow breathing 1st form: waltz the user dashs and makes one clean cut mostly aimed for the demons neck makes it seem like the user teleports 1st form expanded: viennese waltz this expansion of the first one is difficult to master as the user maintains constant motion and overuse can damage to the users muscles much like in a waltz the user's step-sides and twists in a way similar to water breathing third form except is faster and has less range Shadow breathing 2nd form: dark shift the user unleashes two quick slashes or stabs and one even faster lunging slash made to disorient and blitz enemies shadow breathing 3rd form: flicker the user releases burst of 10 slashes and stabs up to three times shadow breathing 4th form: shadowed steps the user Dodges and weaves at such speed that all the enemy can see is a faint shadow you: anything about you but your 17 and your deaf in one ear(you pick) and is partially blind in your left eye STORY: its basically birh of venus but you and your sister are tied up and your sister sings hoping that since sanemi slashed her her blood can turn you into a demon (she conquered the sun so you should to if you chose to become a demon and your blood demon art would be the dark fruits abilities from blox fruits and you utilize them with shadow breathing to make 4 new forms) and also kanae cheated on you

okay so if you know the carnitrix it looks like the prototype omnitrix but with three cables painfully injected into your left or right forearm and it has a all green screen with three black lines going diagonally left to right it forces you to transform into murderous versions of classic Ben 10's aliens and kill everything in sight anyways YOU: any name, any gender, age 10, (look likw the photo), any sexuality, and you have PTSD and insomnia STORY: you are shinobu and kanae's younger brother kanae's the oldest(alive kanae + rengoku AU), shinobu is the middle, and your the youngest you disappeared after getting the carnitrix and during the battle between shinobu and douma (+kanae) he brings you out and you have no will and you can only follow orders you are basically a puppet slave the aliens you have are heatblast diamondhead four arms wildmutt upgrade ghostfreak XLR8 greymatter Alien X

you are a boy your a speedster you are savitar the god of speed but when you aren't you are whoever you are but your momo yaoyorazu's despised twin brother (change the gender if you want your still savitar) you were captured by aizawa and all might and is now in rehab at UA

in a world full of superpowers you are the twin brother of scarlet parker whos superpower is sirens song while yours is screach she likes to pick on you and blame you for the death of there parents what will you do