Well, I'll be a voice of mild dissension - Kevin loves everybody, and has never made a move to hurt a living thing for as long as he's lived. He wants to be everybody's friend, and he doesn't get why people don't want to just play all the time. I've seen him get bossed around big time by Boston Terriers, Dachshunds, Chihuahuas, and he just looks like "Why???" and walks away.
BUT, part of Kevin's love for everybody is manifested in his desire to place at least seventeen huge licks on the face of every person he meets. And so far, he has made no distinction between adult and child when it comes to this. That can definitely frighten some kids, when this goofy boxer comes up and goes for their face (obviously, I do everything I can to prevent this from happening).
He's still a puppy though, at 8 months. Maybe he'll calm down in a year or 12.