What other heroes might have a dark side?
All of them.
I’m not against having some actually thoroughly good people with no dark secrets in the story, far from it, but Wildbow has conditioned me to not really expect them to last like that.
It does seem a lot of the really good ones are Wards, which is interesting considering how we’ve had Interlude-like chapters from the perspective of most of them. But it’s worth noting that during Sentinel, it was relevant to paint Sophia as the odd one out.