Little Joey: The Adventurer

When Little Joey dies in the Universal War, he goes to the Negative Void. He escapes it because he remembers who he was. He tries for three years and gains long hair to get back to Zin and Zon. When he returns, he is a new and improved fighter. He becomes the Adventurer because Zin and Zon replaced him...

 I mean, he was gone for more than 15 years for Zin and Zon, while it was only 3 for him.