I like it. It has plenty of hooks for the DM to use and gives a good idea of the characters personality. You might want to add some bits of detail about his relations to people outside his family and the girl next door.
I'd have to agree here. You'll likely be leaving the family, master and Mia behind once the game gets underway, so in order to more develop how your character plays out personality wise, I'd run him up against normal townsfolk. Maybe give an example of a few of the times he's talked his way out of things and why he had to do it.
I see playful and tricky, that coupled with his masters wishes or his own hunger for adventure (i.e. fun) should be good enough to hinge roleplaying on. I noticed that not much of the other emotions were mentioned at the time. Maybe you could include snippets of what makes him sad, angry, etc... where applicable. Also, I think it helps to actually decide on the types of food ones character likes. It's easy to toss in and also easy to role play.
Wasn't quite sure what "Life, in every breathe we take" meant. Is that essentially live in the moment?
Anyways, not bad at all.