Born in 1984, the Canadian actor didn't have a sitcom to bring him instant tween fame; he had to build a fanbase from movies: the boy-and-dog Air Bud series (1997, 1998, 2001, 2002); the boy-and-unicorn Nico the Unicorn (1998); the boy-and-monster Komodo (1999); the boy-and-chimp MVP: Most Valuable Primate (2000).
By 2000, Kevin had muscled up and was thoroughly established as a teen beefcake star, in spite of the lack of a weekly series (not counting the teen soap Titans, which only lasted for 13 episodes).
But also serious dramatic roles about unconventional young men, sometimes with gender-atypical and trans interest.
The Incredible Mrs. Ritchie (2004): a troubled teen befriends an elderly woman and doesn't get a girl.
that gay men, like "all men," fall in love with women.) But at least he gives a glimpse of some impressive frontal nudity.
It's a Boy-Girl Thing (2006): a boy and a girl, next door neighbors, swap bodies. Woody (Kevin Zegers), inhabited by a girl, likes boys, and is mistaken for gay.
Not a lot of buddy-bonding roles, but The Colony (2012), about the survivors of a new Ice Age, is worth a look for the bond between two men (Kevin, Lawrence Fishburne) answering a distress call from another colony.
I haven't seen The Mortal Instrument: City of Bones (2013). In the original paranormal young-adult novel, Alex is gay. But knowing Hollywood's skittishness about letting juveniles know that gay people exist, I wouldn't be surprised if in the movie version, he's gay-vague, or straight.
See also: Kevin Zegers: Teen Idol