Master of Mutant Design
Kizz is a patron for wizards in the Umerica Survival Guide (a post apocalyptic setting for Dungeon Crawl Classics). And his write up is a little more extensive than most of the other patrons.
Just take any loathsome, disgusting, parasite monster from an RPG of your choice, reskin it as “Gene Simmons”, and you’re already 1/4 of the way there.
(He’s a Trump supporter, that should tell you all you need to know.)
Sounds like Todd McFarlane's KISS: Psycho Circus (1997). Twenty years before that (Jesus, I'm old), there was Marvel's A Marvel Comics Super Special!: KISS, which gave them a powerset that would be much more playable:There was a Kiss comic in the past... I can't remember the details, but it basically showed them as overpowered immortals with immense power.
KISS Meets the Phantom of the Park, in which they have more-or-less the same powers as in the Marvel Super Special.I still remember there live action movie where they had super powers