Piccolo:He's a namek-jin,before him there was a Piccolo daimao who wanted to kill Goku. Piccolo also tried to kill goku during the Tenkaichi Budokai. After a few years he becomes a better person he trains Gohan Goku's son,and fights against Vegeta and Nappa,he also fights Juunana go and Juuhachi go,Cell and Buu. He also travels Back to Namek when they fight Frezza.
Krillin: He's Goku's best friend,they first met when they were over at Kamesenin's island, he is a very strong man.He fights with all the enemies helping Goku.He marries Juunana go when she becomes a good person,he has a daughter Marron.He died once on the series.
Marron:Krillin's daughter,unlike her parents she does not fights.
Juunana go:She's one of Dr. Gero creations. She fights with the Z shensi,and she's absorbed by Cell. She becomes a good person after this big fight,and marries Krillin(or at least gets together with him),she has a daughter Marron.
Juuhachi go: He's another of Dr. Gero creations. He fights along with his sister(Juunana go)against the Z shensi. He is also absorbed be Cell. Unlike his siter he is always evil.During Dragonball GT he meres with Artificial 17,and fights the Z warriors.
Cell: He's Dr. Gero's greatest creations,he absorbs people to increase his power.To reach his max power he absorbs Juunana go and Juuhachi go. He fights with the Z warriors,and he's killed by Gohan.
