Ignoring that terrifying picture, here's what I have for the weaknesses:

Jak: Agility and weapon handling (are we sticking to dual-wielding guns? Cuz I think you should)
Cyril: Fisticuffs
Ben: Ego, long-range and fisticuffs
Abby: Fisticuffs

All I need are Fionn, Daisuke, Prospero, Naoto and Artemis (is she fighting too? Or just support?)