Dead as Disco OC: Sirpa Tähtinen
Aka "The Diva"
She was the third vocalist of the band, a classically trained opera singer. Her powerful operatic alto was a counterpoint to the rapid-fire baritone rap of Prophet and the sweet pop soprano of Arora. She wasn't a main singer in most of their songs but was always there to provide backup even if she wasn't center stage.
Despite considering them all good friends, she felt like her voice was less and less prominent as the group found its groove. She left the band right before their biggest performance, feeling like she might end up stuck if she stayed.
When Charlie Disco died, she wallowed in survivor's guilt, feeling like maybe if she had been there, she could have done something. Harmony offered her a contract, and with that contract, a devil's deal.
Vanity
To relive the glory that could have been while the reality that is crumbles around you.
She now performs to an empty, decaying theater with automata replicating her former bandmates. An illusion makes it appear as if it's a packed opera house, stadium, night club, or whatever else she needs to relive her happier days.
In combat, since she's committing 100% of her breath to her singing, she fights in a spider mech. During the middle phase when she first takes the field, she and Charlie stand on a cracked mirror, with the cracks deliberately evoking a spider's web. For the finishing move, Charlie disables her mech, then saves her from a massive falling chandelier.
