Riku

Rich, snobbish asshole turned criminal turned human experiment turned guy who's still kinda an asshole but also kinda trying to be nice? Riku has zero idea how actual friendships should be formed, thanks to his isolated upbringing, but he does his best for the most part. He's blunt, standoffish and all around unfriendly to those he doesn't know, but has a surprisingly soft and awkward side that most don't get to see. Immune to any sort of chemical poisons (things like bleach and rat poison don't affect him at all), and has the ability to secrete acid from his palmsand fingertips. His voice is permanently very soft due to damage to his vocal cords.