Unlike Goku and Vegeta, Gohan is not a pure Saiyan but a hybrid, born from a Saiyan father and a human mother. This technically makes him only half a warrior race member, yet scientific theories. So, hybrid saiyans that we have seen so far could all of them be Geniuses which Goku and Vegeta weren't.
Hybridization of Saiyan and human may create stronger offspring. Or that theory that a saiyan son is proportionally stronger and how strong was his dad when conceiving it, explaining why Goten and Trunks were SSJ at a younger age of Gohan. Son Gohan (孫 そん 悟 ご 飯 はん Son Gohan) is a half-breed Saiyan and one of the most prominent characters in the Dragon Ball series.
He 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. He is named after Goku's adoptive grandfather, Gohan. A theory states Gohan's Beast form is a hybrid Saiyan ability, born from human emotions that pure-bloods like Goku and Vegeta can't access.
Gohan is an anime and manga fictional character in the Dragon Ball universe. He is one of the main protagonists of the Dragon Ball series. Gohan is the son of Chi-Chi and Goku, the brother of Goten, the husband of Videl and the father of Pan.
Gohan is a human and Saiyan hybrid. He was created by Akira Toriyama. Gohan is also a part of movies, video games and merchandise based on the franchise.
Though Gohan has often been hyped up as Goku's true heir, another Saiyan is the one who truly deserves that title. For decades, fans have debated Gohan's strength compared to others, and one common explanation emerges time and again: his inheritance from both Goku and Chi-Chi. Unlike Goku and Vegeta, Gohan is not a pure Saiyan but a hybrid, born from a Saiyan father and a human mother.
With the introduction of S-Cells. The potential hierarchy for Saiyan-Human Hybrid would go: Bra>Pan>Goten>Trunks>Gohan. U6 Saiyans are evolved Saiyans, well they were stated to have evolved past the need of tails at least.
Broly is a mutant, King Vegeta calls him one in the JP dub. Hybrid Saiyans are part Saiyan by birth, often linked to pure Saiyans such as Goku and Vegeta. They frequently play pivotal roles in their sagas, with some surpassing Super Saiyan to achieve higher transformations.
If Dragon Ball ever gets a new main character, it clearly deserves to be her. Gohan Has Repeatedly Failed to Become Goku's True Successor Gohan is one of the most wasted and most disappointing legacy heroes in all of fiction. Throughout the Saiyan, Frieza, and Cell Sagas of Dragon Ball Z, he is directly built up to be the successor to Goku.