Head and arms Mouse
Chest and legs Tunnel Rat
Vest Walking Dead Carl figure
Hammer Bot Halo Mini Figure

Spike is an expert in robotics. He is an obsessed yet easy going genius who works to create a perfect AI and the first free thinking robot species. His helper and guardian is a little robot he calls Hammer for obvious reasons. It's also his favorite test subject. Any time he has a new breakthrough, he applies it to Hammer first. As Hammer is programmed with a surly attitude, it's not hard to imagine the little robot's reaction.