Rook

Rook is a sapient AI Program that was eventually scrapped and slated for deletion. Yet somehow, Rook somehow managed to barely escape his own destruction with only 60% of his original coding and data intact. With the other 40% unaccounted for, he tried to make up for what he was missing by trying to piece together strings of coding from other games in order to make himself whole. Although his plan worked, it came with the side effect of turning himself into a glitched amalgamation of coding that's barely keeping himself together with a couple hundred lines of potentially corrupted code. Although he can keep himself and the glitches he can cause under control, there are times when he ends up being overwhelmed by those glitches and corrupted instead, turning him from a friendly looking sheep villager, to a violent, unpredictable, and highly dangerous monster. In his monster form, his physical appearance is always constantly shifting and adapting to any obstacles or threats in his way. Usually this sudden transformation happens on its own as the glitched code he tries to suppress starts to build up until it overwhelms him, or it can be caused by extreme trauma or from somehow managing to enrage him. Because of his volatile nature, he tends to push away anyone who tries to get close to him or become friends because he doesn't want them to get hurt.

Apart from that, he's content living out his days as a Fluffy.. glitchy sheep that says Pixels a lot, pixels.