Tinkles looks like a rat-human because he was close to the Accident when it happened. The radioactive clouds were mild, but affected his body: he now has larger ears and a tail. He was a mechanic before the Accident, so he likes to tinker with things. Most of the weapons the team use were made or modified by him.
Tinkles is an engineer type character. He has a melee attack (Wrench) and a long range attack (Drone). His specialty is setting traps on the field. His traps inflict various conditions, such as Assault, Immobilize, Poison, etc.