Hey, Marcello's not a detective all the time. 90% of the time she;s bessing over minute details and craving difficult puzzles like a junkie, but when she's not indulging her addiction to mystery, she's in the deep end with her light addiction.
Marcello likes lights. Her apartment is a mostly-dark place with different coloured glass sculptures lit up to bathe it in a swirling aurora, particularly her bedroom. Her esca is not actually a biological necessity, but a piercing she got because she likes having a lantern hanging off her forehead. She likes laser light shows and... well, stuff. Lights.
So naturally she loves the raves. She might have a problem.
Art by Norithics