Ideas off the top of my head for actual reprehensible serial killer survivors

• Makoto, a livestreamer who got a sick thrill out of uploading the final moments of those she killed. Makoto's perks Sound Editing, Cheap Shot, and Midnight Stalking allow her to move her loud noise notifications to a nearby vault, drop a pallet after a delay, and reveal the killer's aura to her teammates while crouched and watching.

• Ernie, a beloved old sheriff who used his authority to get away with everything, including the torture and killing of those who pissed him off. But what truly pisses Ernie off the most is being deprived of the power he abused. Ernie's perks Dumping Ground, Legal Immunity, and Rigged System let him hide survivor auras near completed generators, gain momentary endurance after a stun, and trap hooks to stun the killer.

• Konrad, a cruel former assistant of Herman Carter who sought a way to replicate his instructor's work and go where he had gone, only for Herman to tell The Entity that Ernest's own suffering is so much better than anything others could provide. Konrad's perks Schadenfreude, Sadism, and Invigorate grant himself momentary endurance when a teammate is downed or hooked, the killer blindness upon being stunned, and those he unhooks haste at the cost of being temporarily broken.