Thanks for all the feedback!
I'm sure you got the character in zone 1-3, it's the healer. The "!" icon doesn't have a big difference between on and off.
Ah, thanks! It's still appearing greyed out though... maybe I broke something
Maybe it's the one in the desert with the cactus? You'll have to get to the end without hitting a cactus (it's ok if you die at the end).