How would you go about having a character that has a pet monster?
Like a kid who befriended some monstrous fey and grows up and now has a monster for a best-friend/guardian.
Let's assume the fey can become invisible.
I see them being helpful to each other and getting each other out of trouble.

Would it just be like a permanent summoned creature?

I'm thinking of a Lay on Hands type of power. Like asian medicine/ kung fu chi.
Lay your hands on the target and the longer you stay connected the more healing is accomplished, or poison expunged from the body.

How would it work?
(I am still reading the rules and I am not sure how to do something like this.)

t.i.a.
Matt