Noctem
Explorer
If he's playing AL, he might not be able to rework his character. Once you hit level 5 you're locked in.
Possibly, but if there's downright vocal anger at the table and you're running the game you can either warn all the players for code of conduct violations or get to the root of the problem. Giving warnings won't solve anything imo, it might in fact make things worse. But really the first step here is figuring out exactly what the problem is. Talking together as a group can give the OP that info and from there, the group can work together to solve the problem(s). Working together to make other characters a little more competitive at the table is one option, toning down the OP's character is another, or both and even none. I am interested in seeing what the results are after an open discussion though.