Gyousei (RotTSs)

Gyousei was a Super Saiyan and an Immortal that appears in Return of the True Saiyans series, he is the Original Super Saiyan and his powers grew so great that he unintentionally faked his death and ascended into an immortal, he was the only individual alive known to achieve Immortality this way or without using the Dragon Balls to wish for Immortality.

Trivia

 * "Gyousei" is the Japanese word translation for "morning star", notably this is also the meaning and title of "Lucifer", a powerful Archangel second only to God and the Bearer of Light until he rebelled again God and became an Evil God himself under the title "the Devil".