Cartaphilus

Cartaphilus (カルタフィルス Karutafirusu): is an unknown being that has lived for over 2000 years, eventually being found and later fused with a man called Joseph.

Trivia

 * Cartaphilus is the name of a legendary figure, called the "Wandering Jew" in English. Cartaphilus was cursed with eternal life following an indiscretion directed towards Jesus of Nazareth.