Goku :
Qualities
-Pure of Heart
-Strongest over all in DBZ
Weakness
-His friends
-Won't risk others
Achievements
-First to Super Saiyan in 1000 years
-First to Super Saiyan Level 4(ever?)
-Killed Freeza
Wife : Chichi
Son : Gohan, Goten
Friends : Almost everyone in DBZ
Enemies : Dr Gero (Andorids), Vegeta (sort of), Freeza, Garlic Jr, Piccolo (at the start of DBZ)
Vegeta :
Qualities
-Second strongest (very close or same as Goku in some stages of DBZ)
-Risks his own life to try and avenge Trunks agains Cell
-Sacrifices himself trying to kill Majin Buu
Weakness
-His pride and Honour
-Trunks and Bulma
-Does anything to get stronger
Achievements
-First to Super Saiyan Ultra
-Saiyan Prince
Wife : Bulma (sort of)
Son : Trunks
Friends : Doesn't really have any, although the Z fighters are eventuly
Enemies : Goku, Anyone stronger than himself
Piccolo :
Qualities
-Strongest Namek
-Risk anything to save Gohan
-Linked to GOD (Kame)
Weakness
-Made out of pure evil!
Achievements
-First Super Namek
Wife : None
Son : None
Friends : Gohan, all of the Z fighters (Goku took some time)
Enemies : Dr Gero and all of the Evil fighters on DBZ
Gohan :
Qualities
-Pure of Heart
-Risks his life for his friends
Weakness
-Doubts in himself
Achievements
-First to Super Saiyan level 2
-Killed Cell (and all Cell Jr's)
-Youngest Super Saiyan level 2
Wife : Videl ( in GT )
Daughter : Pan
Friends : Everyone
Enemies : Freeza, Androids