I don't have either of the characters sharded or at my disposal to play with, but from what I've noticed in the PvP fights so far, I would at least eliminate Storm Eddie and, to some extent, Shaman Eddie from the list.
Why?
Storm Eddie is a great magic damage enhancer, but he usually makes this move in the first round, when the other team has immunity on, so it might be a wasted move (when immunity works and not magically disappears..); also, he's a random healer, and it might not heal the companion in need.
Shaman Eddie can't be build too strong, due to the talisman slots, as it only can support 2 greens, and that might be insuficent for him to last more than a round. Maybe with a proper build-up or support characters could be something, but I haven't tried him yet so much.