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[1]. 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.