It started with Leo because Rick and I were plotting some vampire stuff, but then it eventually crawled to everyone who wore a bowler regularly.
For those unfamiliar, from left to right:
Leo Knox: A Loonatic's Tale, he's the head of the bloodbag and the catacomb vampire clan.
Prof. William Boyer: Noir, he's the leading researcher of noir (the shadow creatures) and also a college professor.
Dr. Jasper Zinc: A Loonatic's Tale, he's Riley Zinc's grandfather and a chemist.