Gohan

Gohan is Goku's son and first child. Due to his mother Chi-Chi's strict study schedule, Gohan is extremely intelligent (being infinitely much smarter than his father) and has a large vocabulary. However, when angered, he is prone to swearing and fits of violence. As an example in Episode 9 Gohan states to Nappa, that he's going "Skull-F**k" him. The former may be due to him being around Piccolo and picking up the crude language he heard the Namekian speak, or it could be passed down from his mother's fiery temper. He was also deeply traumatized due to Piccolo constantly hitting him right before yelling the word 'dodge'. This trauma can get to the point of paralyzing him with fear (there was actually a joke made on this in episode 8 when Piccolo yelled 'Damn you Pavlov!', implying that he had accidentally conditioned Gohan to do so.) Also, Gohan has developed a subconscious hatred for his father, due to Goku's absence from the majority of his life outside of battle. In episode 25, Gohan starts to realize this, asking himself "what dad would do" and imagining Goku saying "Bye son!"

Transformations

 * ===Great Ape===

This transformation occurs when a person with Saiyan heritage (and with a tail) looks directly at a full moon, or something that simulates its effects, such as Vegeta's Power Ball. The result is the waves from the moon stimulating a gland in their tails, enabling a seemingly unavoidable transformation. This is a complete genetic transformation, so it greatly affects Gohan's mental state. Because Gohan never had any proper training, Gohan loses all form of mental control, becoming a primal beast. However during his fight against Vegeta, Goku's words were able to reach Gohan enough to regain some of his rational thought and focus on his real enemy. Gohan only transforms into this state four times throughout the series, twice while he was training with Piccolo, and once when fighting Vegeta, and the final time in the movie TREE OF MIGHT.