Hmm, I think I've got the beginnings of a family tree brewing for Tint, assuming that this is somewhat similar to the Pokemon Red Rescue Team Universe (Which I played quite a ways through specifically for this RP). I know he had brothers and a father, and I know he doesn't have a mother in his life, simply because if he did he would be a mama's boy, and therefor unlikely to sign up. I also know his father travels a lot, settling disputes and imparting Wisdom, so he typically doesn't have anyone home, hence his brothers bullying him. He's also probably 16-18, so he's ready to move out anyways, but has brothers that still live with him...
I'm thinking he'll have two younger brothers who are both stronger than him, but feel no need to prove themselves. They plan to do what his father does, go around and spread wisdom and information, or else sell things. This means that because of his defensive techniques, he can no longer be effective attacked by his younger brothers, becoming aloof, but lacking strong bonds with his parents as well, meaning he doesn't have much attaching him to anywhere. This fits with him well, I think.
It still leaves the issue with his Mother, and also how did his Father pass down his techniques to him? After thinking on it, the answer is simple. His mother is a Xatu that functions like the one in Pokemon Red Rescue team, a strange hermit that stares at the sun at all times and gains wisdom. When his father and his mother met, his father was a part of a rescue team, helping his allies with those defensive techniques he knew. Once he met her he decided to stay with her for a year, trying to persuade her. Eventually he succeeds, and has children with her, but she still always stares at the sun. His father's trips are to tell those who need to hear her words what they are, and her sons are waiting for the day where they evolve into Xatu and take up one role or the other.
This means that Tint speaks to his father when he's home, and they have a close relationship, but it will not affect Tint outside of his direct interaction and personality. He also has very little to no interaction with his Mother, who has a tough time having a conversation and lives a good distance away anyways. He's also distanced from his brothers, meaning he doesn't have anyone practical to confide in, hence is silence.
Alright, yeah, that sounds about right.