Vegetto

Vegetto, or Vegito as per the FUNimation dub, is a Saiyan, who is the result of Son Gokuu and Vegeta using Potara earrings to fuse into a singular being. Because he was created from them, his personality has traits of both Vegeta and Gokuu and has also inherited their memories. Despite being a fusion of both Gokuu and Vegeta, Vegetto's personality appears to garner more of its strengths from the Vegeta-half. He has shown himself to be rude and arrogant in combat, proud of his power and prone to belittling opponents while winning a battle. Vegito wields tremendous power, and he is regarded as one of the mightiest warriors in the entire Dragon Ball franchise.

(Source: Dragon Universe Wiki, Dragon Ball Wiki)