Goku
Goku or Kakrott was sent to Earth to destory it when he was little. But he hit his head when he landed and forgot about the whole mission for life.  He was raised by his "grandpa" Gohan. One night when the moon was full, Goku turned into an Oozaru and accidently killed his grandpa Gohan.  He never knew that he killed him. Shortly after that, he meets Bulma who tells him about the dragonballs (Goku had the 4 star dragonball given to him by his grandpa) so they go off on a quest to find the dragonballs and make a wish.  This is where he meets all of his friends. Eventually, he ended up training with Master Roshi and Krillin.  At the 23rd Tenkachi Budoukai, he meets Chi-Chi, the daughter of Ox-King. Goku and Chi-Chi fight against one other in a match but in the end, Goku is the victor. Some how, Chi-Chi convinces Goku to marry her.  And in the meantime, they have a son, Gohan.  Goku first reaches SSJ1 in his fight against Freeza and dies twice.  When he can't come back to Earth, he stays in heaven.  When Goku's in heaven, his wife, Chi-Chi has a son, Goten.  When 7 years pass, Goku comes back to Earth for a day.  In GT, Goku gets turned into a child and goes along with Trunks and Pan on their quest to find the black-starred dragonballs.  In all 3 series, Goku is the main character.
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