There's not a whole lot to say about Peepers, except that he's proof that even someone like Jack Kirby can have an off day. As a member of a later incarnation of the Brotherhood of Evil Mutants comprised of other name-power characters like "Burner," and "Lifter," Peepers had the uncanny power to... Uh... Well, to see real far, I guess.
No one is sure exactly why Peepers turned away from his promising career as a Marty Feldman look-alike for a life of crime, but we do know that he was initially an enemy of Captain America, and went on to fight the Defenders a lot. He later tried to change his name to "Occult," but like your cousin who tried to insist everyone call him "Snake," I'm betting that most people still just called him Peepers.
He went through a lot of nonsense with Beast and Wolverine, eventually landing a job as a bartender in a super-villain dive bar, and, because Scarlet Witch apparently has a sense of humor, he was one of the 198 remaining mutants after M-Day, though that number quickly dropped to 197, as Peepers was eaten by Predator X.