Adam

Adam is the first man to exist. He was created by God.

History
When Bart did a stand up show he said that Adam and Eve must have been the first bookkeepers, as they invented the "loose-leaf" system.

Rod and Todd asked Ned that if Cain and Abel were Adam and Eve's only children, how did they make more babies, with their mother or with each other?

Rev. Lovejoy had said that Helen and he are as happy as Adam and Eve before Eve munched them all to Hell.

Non-canon
When Eve was kicked out of the Garden of Eden he helped her back in, which led to him being kicked out as well. He was only seen in Marge's dream, portrayed by Homer.