"I know your kind. You think you can just waltz in and take our planet. But you forgot one thing; I'm my father's son!"
Gohan (孫 悟飯, Son Gohan) is the elder son of the series' primary protagonist Goku and his wife Chi-Chi, the older brother of Goten, the husband of Videl and father to Pan. Gohan is the first hybrid (half Human, half Saiyan) to appear in the series. He is named after Goku's adoptive grandfather, Gohan.
Unlike his father, Gohan lacks a passion for fighting and prefers to do so only when the need to defend his loved ones arises. Nevertheless, Gohan fights alongside the Z Fighters in the defense of >Earth for much of his life. He eventually settles down with a family at the end of Dragon Ball Z, opting for the life of a scholar instead.
Gohan's appearance changes drastically through Dragon Ball Z, due to the fact that the series starts out with him as a child and ends when he is fully grown, married, and with a child of his own. But Gohan's basic physical appearance pretty much stays the same through the course of the series. Gohan has black hair and black eyes. He has his father's facial features, and also has his mother's light peach complexion rather than his father's light tan. Gohan is also quite muscularly developed for his age. As an adult, he is similar height to Goku, but he is also a fairly thinner.
When Gohan is first introduced, he wears a child's outfit with his family name, 'Son', written on the front and the Four-Star Dragon Ball attached to his hat, the same Dragon Ball in which Goku believed that his grandpa's spirit resided.
While training with Piccolo, he wears an outfit similar to Goku's original, with the 'Ma' symbol (魔) King Piccolo wore. After training with Piccolo, he has a mullet-type haircut and dons a similar attire to the Namek warrior which he continues to wear until the end of the Captain Ginyu Saga, after which he wears Battle Armor given to him by Vegeta. He would continue to wear clothing similar to Piccolo's for the majority of his childhood, but his hair trended closer to his father's wild self-cut style. While training in the Hyperbolic Time Chamber, he begins wearing Saiyan training gear. He reverts back to Piccolo's clothing for the Cell Games. During this time his hair is spiky much like Goku's.
As a teenager, he alternates between a school uniform, his Great Saiyaman costume, a blue gi similar to the Piccolo clothing (except larger in size), a replica of the gi his father Goku wore while he was alive, and during the Buu Saga, he wears Kai clothing given to him by Kibito. His hair is much shorter and stands on end in a spiky formation.
As an adult in the end of Dragon Ball Z, Gohan's hair would be similar to how it was in the Buu Arc minus the bang. In Dragon Ball Z: Battle of Gods, Gohan's hair is similar to how his hair was in the Majin Buu saga. For clothing, he wears glasses, a blue vest with a long white undershirt, and brown slacks with black shoes.
In Dragon Ball Z: Resurrection ‘F’, Gohan's hair has flattened compared to how it was in the Buu Saga. He wears a grey collar shirt with red pants. On Frieza's arrival on Earth, he wears a green tracksuit because he forgot his gi at home.
In Dragon Ball Super, Gohan tends to wear formal clothing as he studies to become a professor. In the Battle of Gods Saga, Gohan wears the same vest, pants, and shoes as he wore in the Battle of Gods movie. During the Resurrection ‘F’ Saga, Gohan wears a grey collar shirt with red pants as he did in the Resurrection ‘F’ movie. Gohan has lost his gi after not using it for a while.
In Dragon Ball GT, he is usually seen dressed as like a professor or a businessman, in a suit and a tie. He also wears eyeglasses, even though he shows no sign of actually needing them, due to the fact that he does not need them to fight. It is possible, however, that these are reading glasses of some kind, as opposed to general corrective glasses. When facing Omega Shenron, Gohan wears a gi resembling that of the ones Goku used to wear throughout Dragon Ball Z.
In the Assault on the Hell Gate Saga, GT Gohan wears a gi identical to Piccolo's, though without the cape and turban.
Gohan is a shy and studious intellectual child. As a child, he lacks the Saiyan fighting spirit. He must utilize his incredible half-breed Saiyan potential and emotional reserves to protect those he loves, becoming one of the most powerful Z Fighters. As an adult, he achieves his dream career of becoming a great scholar.
Gohan, being only half-Saiyan, is unusual in his values and personality. These unique values and personality separate him from pure Saiyans; as powerful as he is, he does not like fighting much. However, when he is forced to fight, he shows special interest in protecting his family and friends. Like his father, Goku, Gohan has a pure and gentle heart. Also like his father, he has the typical Saiyan appetite and will eat anything. Besides concerning himself with his family (and his studies), Gohan has a strong attachment with his mentor: his father's former archrival Piccolo. After the death of Goku, Piccolo chose to train Gohan as he sensed the boy's potential power, which would be harnessed to help defend the Earth from the attack of the Saiyans. At first, the relationship with Piccolo is a frightening one, but after just one year, Piccolo admits his change because of the friendship he develops with Gohan and even sacrifices himself to save the boy. Because of this, Piccolo can be considered as a surrogate father for Gohan. Krillin also has influence on Gohan, as almost an uncle/nephew relationship, mainly because Krillin is Goku's closest friend. Though he claims he does not share the love of fighting Goku has, Gohan does indeed love martial arts and adventure. It is also clearly obvious he greatly enjoys being a hero. After witnessing the death of Piccolo, Videl and Pan at the hands of Frieza, Gohan realizes that he must get much stronger in order to protect them. Because of this, he asks Piccolo to train him once again.