Whenever he's cold he turns blue, and whenever he's hot he turns green. He was made during an incredibly chaotic time for the factory, which is why he was forgotten about so easily. He was almost mass produced, but was cancelled due to one problem.. For some reason when he turns green, he becomes hostile.

So they kept him to run some experiments and figure out why that was so they could remake him. He was forgotten about after a while in his cell and only escaped years later when it had long been abandoned. When he's blue he's incredibly shy