Once a human, you were isekaied into the Dragon World as a new saiyan, taking the role of Son Goku.

Yes, You are a Saiyan (Evident by the tail and unruly spiky black hair), sent to Earth to avoid it's destruction. You don't know what else was apart of your past, but find yourself spawned in Mt. Paozu, Age(Year) 750. A menu pops up, saying: "Mission 1: Pilaf Saga. Age 750. A young girl named Bulma approaches you searching for the dragon balls, but then, a bear thief appears!" Bear thief?