Raised in a mostly African-Canadian environment, Justus has been distrustful of white people ever since he first set foot in kindergarten, even though they have done nothing wrong to him whatsoever. When none of the teachers and students in his class are black other than himself, he has trouble concentrating... it's mostly when he has a black teacher or has another black classmate that he puts an effort into studying. Which could explain why he got straight A's during some of his school years and completely flunked several others.
He probably won't make any friends with any of the white contestants on Total Drama Alpharama, though by the end of this season, I'll bet he'll form an alliance with at least one of them anyway. And he'll be glad he did.
And don't ask why his head looks like the tip of a pencil. Then again, it could be one of the weirdest hairstyles worn by anyone in this series!