Nickname: Comes across as an excuse to insert part of your SN.
Yes.
Yes. It was. Sorry.
((-Edited out.))
Not taking shit: Wait, so if he takes shit now, why does he still have the nickname?
Above.
Emotions: I'm yet to see a character for whom the line "rarely shows emotions" provided any actual improvement.
Is there really, anything wrong with me using it? It adds to the type of character I want - A hard-ass.
Leeeeroooooooooy: You didn't really say that. Also, Leeroy Jenkins implies lack of efficacy. By all means, go for it if you want, but... yeah.
Of course he has the capacity to produce an effect, he does it faster than most, however he does it more dangerously. Arriving at the same conclusion, but faster and riskier.
Betrayal: By whom? What about? This should be a major shaper of his personality if you use it.
-_-
In his early, early, early, childhood, pre-school. He wasn't picked on, he did have friends. However he was attracted to a particular person there, and so he told his closest friend. This friend than preceded to tell people, out loud, embarrassing James. Of course this wouldn't seem like something an adult would be concerned about, however to James as a child it made become less sociable. Different. This caused him to be picked on, for being different. Eventually he did find a friend, sometime later in the middle of Primary school. The same thing happened, he was betrayed with his deepest secret. This scarred him more, making him more of a recluse. At this time he started trying to control people, this didn't work however. At the start of high school the same thing happened
again, making him even extremely introverted, a recluse, a loner. Because of him being a loner, and the other teenagers being cruel, he started getting beat up. It some time later he stopped caring, stopped giving a shit, that's when he started to fight back, entering the cycle of going to other schools, constantly.
Want me to put this into his bio?
(((Also, edited a bit of technicalities on my original post.)))