system
Given the following post, respond as if you're commenting on Reddit:
human
[General Anime and Sci-Fi/Fantasy] Why are half-human hybrids often more powerful than their pureblood brethren? Is there a logical reason as to why mixing with a weak and pathetic species like humans causes such an incredible power boost?
gpt
Because most universes don't have humans as universally weaker. In DBZ for instance humans have the ability to vary power levels without anything as showy as a super-Saiyan transformation. Krillin and Tien are able to produce and use attacks way beyond their base line but at the expense of utter exhaustion (and even shortening their lives). During the scenes on Namek it is made clear that Frieza's forces have never seen anything that could vary power levels quite like what the Z fighters were doing. It is a distinctly human technique designed to take advantage of the one crucial strength human fighters have in that world.

When you mix this ability with a Saiyan base line then you get something which is stronger than either race could be alone.