The Ferryman has been the most satisfying unlockable character!

[coyoteconscious]

I don't know that it is the best, or most effective character, but there was something utterly, wholly satisfying about drowning all the little monsters to death with the flood power that had so vexed me when turned on me previously.

[wafflekitty]

I agree that his unique gimmick is fun and interesting. Definitely not strong. But fun!