I've explained before why Radec sucks and Fat Princess is better than Parappa in pretty much every way. Better range, better AP building, better Supers.
parappa has better everything than fat princess does, but he isnt broken. for that reason i dont think he should be any lower than middle of the pack, if not stronger compared to the other 5. but he definately isnt broken so he isnt going to be a top tier.
Going by complaints, Kratos > Radec > Sly and then whoever else after that. I don't pay attention to tiers beyond where Sly is placed because he's always placed low on the list despite being so damn good. --- PSN: Key_Amazed PlayStation All-Stars main: Sly Cooper ALL THE WAY!!!!