Vegeta

Vegeta is a full blooded saiyen. He is high-class saiyen. He is always focus on deafeating the low-class saiyen named Kakarot. (Goku. Adoptive grandfather changed his name when he was a child) Vegeta is very ruthless and determined to pass Kakarot's power level. He can't under stand why he cannot turn super saiyen and Kakarot can and he is only a low-level class saiyen. Later in the android saga, he reaches the goal by being mad because he cannot turn Super Saiyen.

Gohan

Gohan is the son of Goku and Chi-Chi. He is a mixed saiyan. All mixed saiyans are stronger than full saiyans. They also have the ability to turn super saiyan at an earlier age. Gohan is stronger than Goku and Vegeta. He is the only person that can defeat Cell.