Z-Type Saiyans are a rare ancient genetic anomaly within the Saiyan race, occurring only once every millennium. The Z-Type gene operates on a strict rule of genetic purity. How much of the ancient DNA a Saiyan inherits entirely dictates their potential and physical traits Attributed Z type: Partial activation of ancient DNA sequences. Standard Saiyan skin tones minor physical changes. Significantly higher than standard Saiyans, but scales linearly Standard SSJ1–SSJ3 forms provide typical power boosts May not reject God ki Full Z type: 100% pure expression of the type. Vastly darker/mostly black skin color Astronomical base strength that matches or surpasses divine entities without requiring a transformation ( if god ki is activated it will fail and they cant tap into ANY god form) Z-Type Saiyan - Cell Rejection - Which is Compressed into Base Form Standard transformations like ssj1 and ssj2 are buffed while ssj3 is nerfed. To break limits, they are forced to rely purely on mortal and primal evolution paths (Ikari, Great Ape, and Super Saiyan 4) True Full Z-Types do not appear naturally through standard breeding they are born through a generational cycle of spiritual and physical reincarnation HOWEVER there is an exception with Kaikor's daughter who is a full Z type but don't follow the rules. Exactly 1,213 years ago, the original King of Planet Vegeta, Named Jicama was a full Z type so technically Kaikor was born as the literal reincarnation of this ancient ruler.
Btw they get embarrassed easily