Gohan was born in May of 757 A.D., about a year after Goku and Chi Chi marry. Gohan, unlike Goku, was raised as a student of education instead of fighting. However he had to start fighting at a young age due to the Sayian invasion of Earth, first by Raditz. Gohan was kidnapped by Raditz, but broke free of his captor when his secret hidden power was released when he heard his father being harmed. After his defeat, Raditz announced two even stronger Saiyans would be coming to earth, later revealed to be Vegeta and Nappa. Piccolo, taking great interest in Gohan and his power, decided to train him for the upcoming fight against the Saiyans.
A year later, when the Saiyans finally arrive, Gohan joins Piccolo, Tenshinhan, Yamcha, Chaozu, and Kuririn in the fight against the Saiyans. Gohan fought well against Nappa, and was so overcome with rage and sadness when Piccolo was killed by Nappa, he became a worthy opponent, to the point where Nappa began to enjoy the fight. He was quickly worn-out, however, and was about to be killed by Nappa before Goku arrived. After defeating Nappa, Goku warned Gohan and Kuririn to leave, as they would only be burdens in the fight against Nappa. They leave, but Gohan quickly rushes back as he began to worry for his father. Going back, he finds his father nearly defeated and begins to try to defeat Vegeta, who is in his ape form. Yajirobe cuts off Vegeta's tail, reverting him back to his normal state. After more attempts to defeat Vegeta, including the Genki-Dama, Earth's fighters are exhausted and cannot continue the fight. Remembering that Gohan is half-saiyan though, tells Gohan to look up at the artificial moon Vegeta created. Gohan transforms into a great ape, greatly scaring Vegeta. Vegeta manages to cut Gohan's tail off, but Vegeta is crushed by Gohan falling mid-transformation. Vegeta then escapes into his space-pod, and leaves Earth.
Gohan, Kuririn, and Bulma traveled to Namek in search of the Dragon Balls, so that they may revive their fallen friends killed in the battle against the Saiyans. But soon after arriving, they were attacked by two soldiers who destroyed their ship. Later, they ran into a Namekian village, where they caught Freeza, Dodoria, and Zarbon slaughtering a group of Namekians who would not tell Freeza where the Dragon Balls were. Gohan kicked Dodoria in the face, as Kuririn saved Dende, and made a quick getaway. Gohan then runs into Vegeta, and gets his power unlocked by Guru. Eventually, Gohan and Kuririn decide to team up with Vegeta to battle the deadly Ginyu Force. Gohan and Kuririn fought and struggled against Guldo, who was killed by Vegeta. Gohan then fought and was defeated by Recoome. Soon after, he witnessed his father's arrival on Namek, and him defeating Recoome, Burter, and Jeice. Gohan was also the first to notice that Ginyu had switched bodies with his father Goku, and bravely fought against Ginyu, even though he was in his father's body.
Right after, Gohan and Kuririn summoned the Namekian Dragon and wished that Piccolo would be revived from the dead, and that he would be transported to Namek. Dende later points out, to Gohan and Kuririn's terror, that wishing him to Namek does only that, and teleports him to a random place on Namek. Gohan, Kuririn, and Vegeta fight against Freeza. Gohan witnesses the impaling of Kuririn by Freeza, and fights in anger against Freeza. he also witnessed Freeza murdering Dende, contributed to Goku's Genki-Dama against Freeza, and witnessed his father's first Super Saiyan transformation. After being told to return to the ship by his father, he does and gets wished back to Earth. There he spends time with the Namekians as they take a long-stay vacation, and in an anime-only filler scene, fights Vegeta and is beaten, for the honor of his father. He also gets very emotional when Dende gets wished back to Namek. He also wonders why Goku has not returned, when it is revealed that he is alive and he survived Namek's explosion. He faced many threats, including Vegeta, the Ginyu Force and the evil tyrant Frieza. Once again, Gohan showed his awesome power against one of the most powerful fighters in the universe. Gohan was wished back to Earth and escaped Namek's destruction.
Gohan was one of the first to notice/be alerted of Freeza's presence during his return to Earth. He was also a witness to Trunks's fight with Freeza and King Cold.
Gohan trained with his father and Piccolo so that they may defeat the upcoming Android threat. When the day came when 19 and 20 did attack, Gohan witnessed his father fight 19. He and Trunks were also the first to discover Cell's molted shell. Eventually, Goku recovered from his heart disease, and trained with Gohan in the Room of Spirit and Time. Inside, Gohan transformed into a Super Saiyan for the first time, and learned how to remain transformed at all times. Gohan decided with his father Goku that they were not going to take their second day in the Room. Gohan spent the majority of the ten days before the Cell Games transformed as a Super Saiyan, as he was trying to lessen the strain of the transformation. He watched his father fight Cell in the opening round of the Cell Games, and Goku, knowing Gohan's destructive power when angered, decided to forfeit the match and have Gohan take his place. For a good part of the beginning of the fight, Gohan was not faring that well against Cell. After revealing to Cell what he thought his father's plan was, Cell decided to try to anger Gohan, creating Cell Jr.s to defeat his friends, and attacking Gohan even harder. After 16 had his body blown off by Cell, he convinced Mr. Satan to throw his head over to Gohan to give him some words of encouragement. After 16's head was stomped on, Gohan's anger caused him to reach Super Saiyan 2.
After this, Gohan easily killed all of the Cell Jrs, and did a great deal of damage to Cell, almost killing him. Eventually, Gohan hit Cell so hard, that he threw up Android 18, reverting him back to his Imperfect form. Cell decided that the best way to handle things was to largely grow in size, and erupt in 60 seconds. Goku then decided it was best to teleport away with Cell to Kaio -Sama's planet, so that the Earth will not be destroyed. Gohan began to blame himself for his father's death, claiming that if he finished Cell off when he had the chance, none of this would have ever happened. Cell appeared in the middle of the battle-field, however, shocking everyone! Cell claimed that the reason he was revived was that the nucleus in his head that allowed him to regenerate was undamaged during the explosion. He killed Trunks, and revealed to Earth's fighters that he can teleport too, and that his power greatly increased since he was brought back from the brink of death. In a fit of rage, Vegeta attempted to attack Cell for the death of his son. Cell quickly batted him away, and tried to destroy him with an attack that Gohan blocked, causing him to lose the ability to move his arm. Cell decided to fire a Kamehameha to defeat Gohan. Gohan was not confident, however, and believed he was not able to fire a strong enough Kamehameha with one arm. Goku, from the afterlife, encouraged Gohan that he did have the strength to defeat Cell. Gohan fired his Kamehameha, and with Vegeta's help, defeated Cell. After Cell's defeat, Gohan and the others went up to Kami's lookout to wish everyone back to life. He also was the first to realize that Krillin had a crush on #18.
Majin Buu Saga
After defeating Cell, he was next seen years later at the age of 18 attending high school, where he adopted the identity of the Great Saiyaman, fighting crime. It was here that he met Videl. Even though he hadn't trained in a while, he and all the other Z Fighters joined the World Tournament. It was here that they met the Supreme Kai and learned of the threat of the wizard Babidi. After Spopovich's battle with Videl, Gohan goes to visit Videl and gives her a Senzu Bean. Later, in his match with Kibito, he is prompted to transform into a Super Saiyan and show Kibito his power. He reluctantly agrees, does it, and then transforms into a Super Saiyan 2, mainly for the intent of showing off. Spopovich and Yamu then attack Gohan to try to absorb his energy for the awakening of Majin Buu. The Supreme Kai requests that Goku and Piccolo not interfere, and he restrains Gohan's energy, making him vulnerable to their attack. He is healed by Kibito, where Supreme Kai leads him, Kibito, Goku, Piccolo, and Kuririn to Babidi's spaceship. Gohan was with his father and Vegeta when they faced his minions. But Babidi used his magic to control Vegeta and this gave Babidi enough energy to resurrect Majin Buu. When Gohan fought Majin Buu he was easily defeated by the seemingly invincible enemy.
Supreme Kai saved Gohan and took him back to his world. Gohan was able to do something no Kai had ever done, pull the Z Sword from it's stone prison. He trained with the sword but when it was put to the test, it broke. Out of the sword emerged the Old Supreme Kai, who was able to perform a ritual that unlocked Gohan's hidden powers, making him a powerful warrior. Gohan was brought back to Earth and had nearly defeated Buu, until Buu absorbed Gotenks. Gohan was eventually absorbed himself, and died when Kid Buu blew up the Earth, but was later revived by the Dragonballs.
Gohan would marry Videl and become a teacher. Together they had a daughter named Pan.
Powers & Abilities
Like most characters in the Dragon Ball universe, he can fly and fire energy blasts.Thanks to his Saiyan lineage, Gohan posses vast superhuman strength and speed. His main attacks are the Kamehameha and the Masenko. He has been trained by his father and Piccolo, two of the greatest fighters on Earth.
He can also transform into a Super Saiyan which increases his power exponentially. Toward the end of the series after training with the Old Kai, he gains the ability to transform into what is known as mystic Gohan, also known as ultimate Gohan, which gives him greater power than his previous Super Saiyan forms.
Oozaru (Great Ape)
Gohan like all Saiyans can transform into a giant ape by absorbing light reflected by the Moon (Moonlight) and channeling the light through his body into his tail which triggers a natural reaction that transforms Gohan into a giant ape with blood red eyes, brown fur and a large tail. While in his Great Ape form Gohan retains to no aspect of his personality and is extremely violent, save, brutish, mindless and virtually uncontrollable and he loses a great deal of intelligence while in this transformation. In addition this transformation multiplies Gohan's base power by 10. If Gohan's tail is cut off while he is in this form he will revert back into his base Saiyan form and if his tail is cut off before he transforms he will be unable to transform into a Great Ape unless his tail regrows.
Gohan, like nearly all of the Saiyans on Earth, is able to transform into a Super Saiyan. Like all Saiyans, when Gohan is in his Super Saiyan form, his physiological attributes are dramatically increased in strength, speed and more. His energy manipulating abilities are also increased. Gohan's appearance includes upright golden hair, blue eyes, an increase in muscle, and a flame-like golden aura. Gohan's immune system is greatly reduced and he becomes a lot more vulnerable to diseases and this vulnerability is increased in each form after the Super Saiyan. Gohan through intense training with Goku in the Hyperbolic Time Chamber is able to reach the physical and mental perfection of the Super Saiyan form dubbed Full Powered Super Saiyan. In the Full Powered Super Saiyan form his power and speed surpasses that of the Androids and is nearly equal to Perfect Cell's power.
Super Saiyan 2
Gohan was the first Saiyan on Earth to ever reach the Super Saiyan 2 or ascended Saiyan form. He first displayed this when he was training with Goku and was knocked down. Due to emotional stress, he momentarily transformed into a Super Saiyan 2 until falling unconscious because of excess wounds during training. He later transformed fully into a Super Saiyan during his battle with Cell when Cell stepped on Android 16's head while 16 was talking to Gohan whom he considered a friend. This caused Gohan to be in much emotional stress as he witnessed his friend be destroyed which triggered the transformation. Gohan's last transformation into the Super Saiyan 2 was during the Majin Buu Saga when he was fighting in a World Tournament. After that day, he was never seen to transform into a Super Saiyan 2 however he did transform into a Super Saiyan 2 prior to the World Tournament in order to fight Broly. Like in all Super Saiyans forms, Gohan's physical attributes are increased dramatically and his power exceeds the previous Super Saiyan form greatly. The appearance of a Super Saiyan 2 are larger muscles to the previous form, the user's hair stands straighter with fewer bangs of hair hanging over the forehead and the hair increases slightly in length and has a more golden color, and blue electrical arcs occasionally appear (and are more prominent when the user powers up). Gohan's personality also changes from his previous forms since his face remains stern. The user's personality is more arrogant and confident. Also, the user is more likely to ignore advice from others and has a tendency to display their superior power by showing off. Gohan has displayed a hidden power since childhood and the hidden power is responsible for Gohan's ability to transform into a Super Saiyan 2; however, he never masters this form and the reason for his hidden power is that he is a hybrid Saiyan/Human which was theorized to be more powerful than pure blooded Saiyans.
Mystic or Ultimate Gohan
The Mystic or Ultimate Gohan is not a transformation such as the Super Saiyan or Super Saiyan 2. It is Gohan's full power and potential unlocked. This is revealed when Elder Kai performs a ceremony to unlock Gohan's latent abilities. When in the Mystic state, Gohan is unable to transform into a Super Saiyan nor Super Saiyan 2 as his full power is already unlocked and he is in his normal form and possesses overall power far greater than the Super Saiyan and Super Saiyan 2. His appearance is slightly different to his normal form though he does not gain golden hair, blue eyes or golden auras, his hair is slightly longer, stands straighter with fewer bangs of hair hanging over the forehead and the hair seems sharper, his muscles become slightly bulkier and increase slightly, he has a white flame-like aura and his personality is changed. His personality is much more confident and arrogant in contrast to the Super Saiyan and Super Saiyan 2 forms and the user often grins when displaying or showing off his power and is most likely to show off or display his superior power to his opponent and might brag about his power during a battle. It has been claimed that in this form, Gohan is not only stronger than a Super Saiyan 3 but that he is also the strongest non fused fighter in the Dragon Ball Z series.