Krillin originated in the Dragonball series. He has always been Goku's best friend in battle and in every day life. Krillin trained with Master Roshi on his little island with Goku. Krillin is human. Often times Krillin steps forward to face any challenge, but mostly gets beat up. All throughout Dragonball and Dragonball-Z, Krillin is with Goku. He has fought against Nappa, Vegeta, the Ginyu Force, the Spice Boys, Frieza, Cell, the androids, and many other foes in his carreer. He was married to Android 18 and had a daughter named Marron.
