Leo

    Leo is in 12th grade and is near the end of high school.
    Stargirl is his girlfriend because he likes different people like her.
    He has a friend named Kevin.
Leo drives a pick up truck.
    When he first came to Mica High School he wanted a porcupine necktie. At the end of the book he got what he wanted.

At the middle of the book he wouldn't admit that he liked Stargirl.
     Leo told Stargirl to act like everyone else when Stargirl prevented it right after Leo told her she became a girl like every other girl at "Mica High School" she called herself Susan(Her original name).

He and his friend Kevin hosted a show called "Hot Seat" before Stargirl met Leo. Leo wanted Stargirl to be on their show but Kevin got concerned because he thought she was to weird to be on thier show but Leo kept on asking and asking. Kevin was his only friend before Stargirl came.

But as Stargirl was becoming disliked, Leo was starting to like her. Leo started to be disliked.That made Leo dislike Stargirl.
Probably Leo is still looking for Stargirl