What characters do you think are at the bottom of the barrel in this game? Also, do you think that these characters are so bad that they're fairly hopeless, or do "tier lists" not matter too much in a game like this?
Fat Princess has good combos and set-ups, but aside from her okay-ish level 1, getting kills is a nightmare for her. The chicken is almost worthless, it's just a slightly longer lasting version of Parappa's that happens to be much worse at actually getting kills, and her level 3 I've not seen get more than a few kills across every single beta and the full game. She's just not worth the effort she needs to be good.
Jak's better than FP by a longshot, but still not as good as he should be. He doesn't get enough meter and a lot of his guns actually don't have very good range. His level 1 can be pretty good, his level 2 isn't worth saving up for, and his level 3 is one of the better transformations, but again, not worth saving up for. He just seems like he has a lot of problems that could easily be fixed but weren't.