Akira Toriyama's Dragon Ball has dozens of compelling characters in its core cast, but it's always hard for the series to get some distance from Goku. Goku has been Dragon Ball's guiding light for more than three decades, and the franchise continues to largely position him as the central protagonist. Goku's strength is rarely in question, but there's a certain juvenile innocence that the character has retained that's led some to believe that he hasn't grown much and truly changed.
Source：https://www.cbr.com/dragon-ball-goku-secretly-has-biggest-character-development/
