GOKU
RACE:Saiyan
STRENGTH:Very Strong
STATS:Goku is the main character in DBZ. He is tremendously strong. He was sent to Earth as a baby and raised by grandpa Gohan. Goku has fought and won battles against Cell, Raditz, Buu, Vegeta, Frieza and many more. His wife is Chichi, his son is Gohan, and Goten, and his brother is Raditz.
GOHAN
RACE:Saiyan
STRENGTH:Very Strong
STATS:Gohan is the first of the saiyans to go super saiyan 2. He exhibits huge power when he is enraged. Gohan defeats Cell with the help of his dad. Gohan also helped fight off Frieza, Vegeta, Raditz and many more. Gohan's parents are Chichi and Goku. his brother is Goten.
VEGETA
RACE:Saiyan
STRENGTH:Very Strong
STATS:Vegeta is the prince of the saiyans. He is the first truly strong being that we see. Vegeta gets angry after seeing Trunks and Goku turn super saiyan and that is his motivation. Vegeta helped defeat Frieza, Cell, Buu and many more. Vegeta's dad is King Vegeta, his wife is Buruma, his son is Trunks, and his daughter is Bra.
(Keep in mind that the biographies are only the characters that I feel are vital to the series).