I think I would have to say that I like Peter the best, he's so random and funny. He's just a great character in my opinion. I don't laugh at the others as much as him! Stewie is pretty cool too, he's a baby with a football shaped head and English accent, that's pretty darn cool to me. Brian is a good character as well.

They are all awesome in their own unique ways really. Peter is my favorite though by far.