akikan40
Saiyans are overused how about viltrumites. They have the same infinite potential, they adapt to near anything short of death, and their power increases with age. Also, they have near perfect genes that can override any downsides in offspring. Their powers are more instinctual, like breathing or walking, so there's no need for massive amounts of training. Just a little practice to get the hang of their powers, but they can train further for even more power.