Son Goku
Race: Saiyan
Children: Gohan and Goten
About Goku: Goku is the main character of Dragon Ball Z. He is a a very forgiving kind of person. He is also the most powerful warrior on Earth and the first to become a Super Saiyan in over 1000 years. Having honed his skills and strengthened his spirit to a level never achieved by anybody on Earth, Goku is able to fly, shoot energy beams from his hands, move at incredible speeds and, when in a pinch, power-up to a fighting level so high it creates an energy aura around his body and makes him turn blond with green eyes(Super Saiyan) which makes him become a walking nuclear war. Goku hasn't learned these skills just for fun, his life is forced down this path as he battles the evil Saiyans in the final battle to save the Earth. When the Saiyans arrive on Earth it is a shock in more ways than one. Goku finds out the mysterious secret of his own past: he is Saiyan formerly known as Kakarot who was sent to Earth as a baby with the mission to conquer the planet. Luckily for Earth a near fatal head injury makes him forget his mission and instead of becoming a destructive super-warrior he becomes an innocent pure-heart defender of Earth. Goku was raised by a peaceful, wise old man named Gohan, after whom Goku later names his first son. Goku is always there to help his family and friends and he is very protective of them. If he has a weakness, it is his trusting nature. Goku has many powerful fighting techniques including the powerful Kamehameha Wave and the Kaio-ken which he learns from King Kai. His last and most powerful weapon is an immensely powerful energy ball which garners energy from all sources on the planet, concentrates it into one sphere, and then releases it in one mighty swoop. This ball can be used only once and must be guided carefully for it can destroy the planet if used inappropriately.

Son Gohan
Race: Human/Saiyan
Children: Pan Gohan,
About Gohan: Goku and Chi-Chi's first son, was named after his adoptive grandfather. Physically, he resembles a young Goku right down to the tail and the propensity to become an uncontrollable raging Giant Monkey, while spiritually, he is good and pure of heart as well. Because of his protective mother, Gohan starts out as a wimp, but when the Earth is threatened, he reveals his tremendous potential as a fighter and uncontrollably "powers up" in order to rescue his father from a desperate situation. Because of this he is forced into training in preperation for the arrival of the Saiyans. Gohan's training is at the hands of Piccolo because his father is learning the fighting expertise of King Kai. Piccolo and Gohan develop a special bond, which causes Piccolo to step in front of Nappa's mighty blast to save Gohan's life. Gohan's loss of nerve in the battle against the Saiyans cost all his friends dearly. But he is determined to make up for his cowardice by traveling to the planet Namek to find the Namekian Dragon Balls and wish his friends back to life. Gohan's tremedous power is accounted for by the incredible mix between Earthing and Saiyan, which produces an even stronger being than either Human or Saiyan alone. Even though Gohan becomes the most powerful non-fused character, he never attains the love of fighting that Goku has.

Piccolo
Race: Namek
Children: None
About Piccolo: Piccolo is the second strongest being on the planet Earth. He is the evil side of Kami(the gurdian of the Earth). Piccolo was Goku's enemy, but later was forced to fight together against Radditz which resulted in Piccolo joining Goku in the fight of evil. He trained Gohan to fight Vegeta and Nappa and revealed his hidden powers.

Vegeta
Race: Saiyan
Children: Trunks and Bra
About Vegeta: Vegeta is a prince of the planet Vegeta, and is the most powerful and feared of all the Saiyans. Cunning, ruthless, and cruel in battle, he enjoys toying with any helpless creature who opposes him. He comes to Earth with Nappa, another Saiyan, to conquer the planet. Vegeta and Nappa underestimate the Z fighters by thinking the mission will take only three days, when in fact, they never succeed. Vegeta gets so fed up with Nappa that he mercilessly kills him. Vegeta looses the battle on Earth, but escapes death because of Goku's generosity. Vegeta goes to Namek in search of the Dragon Balls with the wish for immortality. Discovering he cannot defeat Frieza alone, he fights with Gohan and Krillin, and then with Goku and Piccolo when they arrive. Later on, after the Freeza Saga, Vegeta becomes a Super Saiyan! He becomes so enraged that he cannot become a Super Saiyan that it causes him to to blast into a Super Saiyan!

Krillin
Race: Human
Children: Marron
About Krillen: Krillin is Goku's best friend. They've studied martial arts together under Master Roshi as kids. Krillen is a kind of clumsy, funny kind of guy. When they are not fighting, he's usually the butt of jokes. He can and has saved his friend's life more than once. In fact, Krillin unleashes an incredibly powerful energy blast shaped like a flying disc that literally slices through mountaintops. Krillin is incredibly dedicated to his friends, especially Goku, and holds friendship in high value. He is willing to fight against the Saibamen and Saiyans even though he doesn't want to die. Goku encourages Krillin to have confidence in his own abilities as Krillin learns to be a remarkable fighter that is, for an Earthling. Krillin volunteers to be one of the crew going to Namek to gather the Namekian Dragon Balls. On this journey he once again gets to prove his loyalty, courage, and fighting skills. His power is enhanced even further by the eldest Namekian, Guru, when he awakens the sleeping power within Krillin. He will need every ounce of this power he has to fight against the evil forces assembled on Namek.

Trunks
Race: Human/Saiyan
Children: None
About Trunks: Trunks is one of the coolest chracters on the show (in my opinion). Trunks is the first child of Vegeta and Bulma. There are two Trunks in the DB universe: Future Trunks comes from 14 years in the future where evil androids rule the Earth. He goes back in time after the death of Freeza to prepare the Z warriors for the androids arrival. So as not to prevent his own birth, he tells no one of his heritage, except Goku. Chibi Trunks is born after Future Trunks returns to his own time. He likes to hang out with Goten and they are very good friends. When he and Goten are together, Trunks has a tendency to get them in trouble. Trunks is also sad that he does not have a brother like Goten does. Trunks has purple hair and displays extreme levels of power, Trunks reached Super Saiyajin when he was eight. Despite Trunks' ability to get Goten and himself in trouble, he means well.