Mimi should start a girl band with Ember, Charm-Caster and Marcelline... Please do a spinoff comic or at least one comic page!
Lead Guitar/Vocals: Ember Rhythm Guitar/Vocals: Marcelline Drums: Adult Mimi(She stands at the drums, as sitting is for the weak and feeble) Electric Organ: Charm-Caster
Ember is normally POP-Rock, as in the show her music style and lyrics border more on the Disco/Pop than rock. Although, do to her attire and use of face makeup and dyed hair, she should be Glam-Metal. I would think ideally she should sound like a Metal version of The Runaways.
Mimi is obviously Heavy Metal, because of how she looks and the fact she has metal crab claws for hands.
Charm-Caster is Swamp Blues, because she's Voodoo, and Voodoo is very popular in Southern Louisiana where there are many swamps (Bayous). Also the fact Mimi is a Devil, a classic Blues theme. Her spell-book could be open on her Voodoo Electric Organ.
Marcelline has two sides, on one side she has the Metal and on the other the Coffee Shop Singer and Song Writer. She would be great working with Ember on vocals and lyrics, due to their similar voices and range. This would allow Ember to break into a more Hard Rock genre, while Marcelline combines her native genres.