Adding a chibi version pet after killing the main boss!

I mean Like there's a dragon it's like a boss that spawns at certain space or spawns at night and it's a One time kill only mob and after you kill it you get an item and when you press right click with that item in hand it will summon a chibi girl looking type dragon pet that follows you and attack hostile mobs.

So what I'm thinking is to add a horrific looking or crazy looking mob that has over 100 health and a good attack and when you kill it you can summon it's chibi girl version as pet.

THIS JUST SOUNDS SO GOOD LIKE JUST SO GOOD I WANT A COMPANION HELPING ME OUT ON MY JOURNEYS!!!