The Easter Bunny is the patron of the holiday Easter.
Little is known about the original Easter Bunny, as Bun-bun squashed him with the Mark I within moments of his first appearance. The role of Easter Bunny was next taken by the Mecha Easter Bunny, built by Santa Claus using some of the original bunny's DNA. Bun-bun kills this too, and thereby himself becomes the Easter Bunny by right of caste. He views this as a curse, which he goes to some lengths to shake off.