if you somehow get rumia, here are some things to know

-she is a man eating youkai, which means she eats humans

-she can control darkness. despite this, shes to lazy to hunt literally anybody

she may appear young (10 to 14) but her age is unkown

-she first made an appearance is eosd (might be her only official one)

-despite controlling darkness, she cannot see in her own personal darkness orb she uses and bumps into trees

-her skin and hair are photosensitive, which means they are sensitive to sunlight, so she doesnt like going out in the day, but if she does, she uses her own personal darkness orb

on to step 1. now

give her a living space. make sure it doesnt have much light, since her skin and hair are photosensitive. this could be a room without any windows but with lights, but just enough light so she can see

if you want to feed her, always remember to give her meat. if she tries to eat you, always remember to give her something else to eat like some pork (she likes her meat raw btw). she is a carnivore, which obviously means she eats ONLY meat

if she does something bad (e.g. try to eat a family member, a friend, a loved one, or somebody you know) just remember to discipline her

so now you know how to take care of a literal youkai that might eat you, your family members, your friends, your loved ones, or people you know. i wish you luck in this task (if you found her and want her in your house)