Arrogant Band Leader

Don't ask what I was thinking when I came up with his outfit. I don't know.

Anyway, this is a 15-year-old American guy who attends the Japanese branch of an international school, or something. He's incredibly smart, which is likely the source of his arrogant nature. He believes his band is better than the rival one set up in his school by virtue of his presence in it. He loves maths and coding, though he doesn't want people to know he's into web design too much.
He's the lead guitarist of his band.