The Saiyans are the most popular race of characters in the Dragon Ball series. While this mainly comes down to Goku, the main protagonist being a Saiyan, it's also because the late Akira Toriyama, the series creator, has gone to great lengths to etch out the lore about Saiyans. They're a powerful race of warriors who have an insatiable thirst for battle and have limitless combat potential. However, this doesn't necessarily make them insurmountable or undefeatable.