ZERO (Sonic)

ZERO, also known as E-100α or E-100 Alpha is a character in the Sonic the Hedgehog series. It is the prototype model for Dr. Eggman's E-100 series of robots, designating it as the zeroth E-100 unit. During its last mission to recover Chaos Emeralds, ZERO relentlessly pursued Amy Rose for the Chaos Emerald she unknowingly had until it had harassed her to the point of being on the receiving end of Amy's hammer.