Arrrggh ! You don't know Dragon ball ? Well, I'll try to explain you the story. I hope you've got time...
It all begins when Bulma meets Son Goku. She is looking for the "Dragon Balls". When you have the 7 balls, a dragon (Shenlong) appears and grants you a wish.
On the right : Shenlong summoned from the Dragon Balls.
On the left : one Dragon Ball. The first Dragon Ball gots one star, the 2nd gots two...
But the Z-team only trys to get the Dragon Balls two times. After, they are fighting all the time. The heroes train and become stronger than the enemy. That's quite all ;). eventually, the characters are so strong they can destroy a planet. When some die, they rise them from the dead using Dragon Balls.
He is a Saiya-Jin. He can be more powerful by going Super-Saiya-Jin, his hair turn yellow then. He became a Super SaiyaJin for the first time on the 27th Manga.
Friend of Son Goku (meet in 3rd manga). At the begining, he is bald (left), at the end, he has hair, he maries C18 and have a daughter (on the right). They both have no nose. Yurk !
Bald man with 3 eyes. At the begining, he was evil but Kamesennin made him a good man. Tien is always with Chaoz.
He is a Namek, he is green. In the begining, he was evil, but while he was training Son Gohan, he became good (he save Son Gohan from death giving his own life).
Son of Goku, he can become a Super Saiyajin also. He was trained by Piccolo. He is very powerful but after he destroyed Cell, he stopped training for studying. So Vegeta and Son Goku became stronger than him.
He is the prince of the Saiya-Jins. He always wants to be the stronger. He hates Son Goku and always want to beat him. He is never happy. At the begining, he wanted to kill all the earthmen, but after he fight against Freezer, he stayed with the DBZ team.
Second son of Son Goku. He'll see his father for the fist time when he was about 6 because his father was dead. He is friend with Trunks. (Picture : Son Goten and Trunks)
Left to right, then up to down:
Little Trunks, Gotrunks,
Adult Trunks, SonGoten, Vegeto,
Vegeta, SonGoku, SonGohan