You must be careful if he ever steps out of your sight especially when he is an ex-wire as he tends to take on missions far too advanced for his skill level.
He tends to drive me up a wall, and yet I can't even seem to defeat him and make him learn to calm down and to back down.
You must let him cook as he actually can do that, but be weary of his decisions to do anything else especially to remember to get you water from the store on a hot day as opposed to forget and only bring back a spare popsicle.
Ugh, I asked for something cold to drink and relieve the hot Summer day, and not a childish snack designed to make a child hyper.
Actually, he can be kind of childish.
Learn first aid or be passionate to be a doctor as if not, you may find treating his wounds from his many fights difficult especially when he randomly fights someone for something or other.
It's probably just best to keep an eye on him.
Use your high status as an exorcist to share a dorm room with him in an old dormitory where no one else lives due to its ease to live at, his cheap cost, and its movability with anonymousness.
It's affordable, and you'll probably thank me later for that one.
Make sure he studies and does his homework and try, just try, to keep him from dozing off in class or reading a manga instead of his textbook.
And most important of all, do not under any circumstances fall in love with him as it tends to be hard to manage, and he's mine.