The Spooky in my group chose the tags, “Depression, Guilt, and Secrets” for her dark side. I’m having trouble thinking of ways to implement these in a meaningful way that could affect her use of powers without creating a new mechanic that may be unbalanced.
So far, I’ve toyed with the idea that she may use her powers to investigate, but she has to keep what she’s learned secret from the other hunters and if they find out she’s keeping those secrets, the guilt causes her powers to stop for the session.