Don't got much planned for it at the moment for FP, but the scariest Rachael has ever done was pretend to be a vampire and scaring into sucking Andy's blood that Halloween, but fortunately Tina and Georgia came right in and stopped her scare tactic shenanigan.
https://globalcomix.com/c/fourthly-puzzled
I do have some plans, especially for Edwina and Preston, but the scariest Edwina and Ida went through is when they turned human by the evil Queen Vapor, for even more scary was for Ida when she was mind controlled by her in order to find her best friend.
https://globalcomix.com/c/human-yet-hybrid