Roy is quite unusual in some ways. He genuinely doesn't care what people think about him, and honestly thinks that if they don't stand him at his worst, then they don't deserve him at his best. He's stubborn, pessimistic, arrogant, but doesn't really pushes people away. He's just not very welcoming. Roy tends to be snarky, sassy and witty. Many people think he's funny at first because they don't think he's actually serious about many stuff, which, he is.
Other than that, he is much of a strategist and a forethinker, although he has never been one to be known for particularly high grades. That is mostly because he is lazy. He's very organized, though, and if something piques his interest, he'll chase on no matter what. He has a very strong patriotism for his fire element, which is ironic, as he has his earth powers far more developed as he was forced to studying in the Vineyard National School, institution that he absolutely loathes.