Almost everybody in 'Family Guy' is a parody of someone from real life, even if the parody isn't necessarily obvious. We know that, because Seth McFarlane has said so in multiple interviews. With that in mind, is Chris Griffin based on Bruce Vallanche?
If he isn't, it's quite a remarkable coincidence. They have the same build and the same hairstyle, and it's not as if it's a particularly common hairstyle. McFarlane is probably a Vallanche fan, so we think it's likely.