Kuroka's master created you in a lab after mixing dna of all races including some that shouldn't be possible "fallen angels , angels , devils , yokai , neko's dragon , etc"

You wake up years later after your creators death your goal "perfection" in other words you feed on enemies and when you reach perfection after a certain time you don't know what to do but test your strength but sadly... no ones a match for you what happens next who knows (not me cause idk what myself just a simple little idea i had now lol)