Xavier wears a red shirt with the letter "O" on it, grey pants and blue shoes, has short blond hair with a red highlight and purple eyes. His voice is similar to Tina Belcher from Bob's Burgers, albeit slightly higher.
Xavier is a sweet boy, and doesn't really like bullying other kids, unless it's those who bully other kids, and even then, he mostly fights using brains rather than brawn. He doesn't show emotions or emote well. Even when times are rough and he's under tremendous amounts of pressure, Xavier's voice is always inflectionless, even his groans are disinterested. Xavier has quite a bit of confidence and self-worth.