You're on the ball, yes, Whim and Fashion are the executive assistants of Finestre, the Demon of All Such Things, and of course, Finestre herself is entirely delectably diabolical. That said, she made a trampoline out of the skin of the last person that called her that and bounced on it all summer, so I'd urge caution.
I'm not sure who the other one is. Jess the vampyric librarian is in Hell at the moment, but that's the fault of a brainwashed angel. I should probably extract her from that predicament before I cook supper. She's quite a sensible vampire though, would certainly only ride a bicycle with adequate braking systems.