Heuristic Model 01-Alpha, also known as HM-01 and (occasionally) Hypotenuse Man. Shortly after its creation, this hyper-advanced AI escaped from the engineers who built it and set about improving itself in any way it could. In one canon, it even invented devices capable of traveling through time, space, and dimensions. However, it is easily disabled by electricity, its chassis is more fragile than it likes, and it has an ego roughly the size of the planet Jupiter.
This bot was my avatar for most of my online haunts for many years! I have a soft spot for it.