Joe took Peter, Cleveland, & Quagmire & owned them.
They would both die in a fiery barrage of atomic bombs from Homer Simpson and Peter Griffin.
Chris
Obviously Stan Smith. He carries a gun and would simply shoot Peter.
Considering Peter has walked away from each fight while Ernie lain beaten and bloody, and considering he's the main character on the show, Peter would ultimately win.
Peter
Cartman's a kid, Peter is an adult (and tougher than he looks, judging by the punishment he deals and receives in his recurring fights with the guy in the giant chicken suit). Peter would mop the floor with Eric.
Hippogriff
dragon because on bakugan dragonoid beats griffon
barney
Peter Pelvises, I hope...
34,000 $
He's a real cartoon character.-And considering there are 7 billion people in the world, it is certain there is a real someone somewhere named Peter Griffin.