Will-o-Wisp is way too weak, not useful, and is a limited ability, which doesn’t make much sense for one of three core Investigative BD classes.
I propose either one of the following changes to make Will-o-Wisp more useful and effective, yet still a niche for the Princess. All Investigative Abilities will continue to not be able to target the King.
Matchmake: (N) (2)
Compare two players and see if they are of the same faction.
Will-o-Wisp: (N) (2)
Compare two players and see if their class types are the same.
To make it fair for Cult Leader and Mastermind however, Mastermind’s In The Shadows Passive should make Mastermind appear as an Investigative class. Prince should also be changed from a Blue Dragon Killer to a Blue Dragon Special, which makes sense overall for the Prince in my opinion.
And the most important thing to note is that this change would not make the Princess more confirmable than she is right now.