Gogeta

Gogeta is one of the fusion characters from the Dragon Ball game series. He is the immensely powerful result of the Fusion Dance between Goku and Vegeta (when they perform the Fusion Dance properly), whose power is said to be greater than both individuals combined. His voice is a dual voice containing both Goku's and Vegeta's voices. Like his Potara Fusion counterpart, Vegito, he is regarded as one of the most powerful characters in the whole Dragon Ball franchise.

Original
Goku and Vegeta find themselves outmatched by the monster Janemba and agreed to fuse to gain an upper hand, despite Vegeta refusing at first. Their first attempt resulted in an embarrassingly weak fusion (known as Fat Gogeta by South Kai and the fans) due to Supreme Kai noting Vegeta failing to extend his index finger properly in the final step of the dance after the failure. Thankfully, they managed to succeed in their second attempt thanks to the help of Goku's ally, Pikkon, and managed to defeat Janemba with their immense power.

Later onward, Gogeta is shown near the finale after Goku and Vegeta fuse into him whilst in Super Saiyan 4 to fight Omega Shenron, but since the power on SSJ4 was so great it decreased the Metamoran Fusion time limit to a whole 10 minutes, the two Saiyans defuse before defeating him.

Super
Goku and Vegeta decide to perform the Fusion Dance after being overpowered by a rampaging Super Saiyan Broly. After two humorously failed attempts, both Saiyans manage to succeed their third attempt, resulting in forming the powerful warrior, Gogeta, who manages to overpower Broly with relative ease, but was unable to finish him off as he is wished away to Planet Vampa by Cheelai.

Trivia

 * Gogeta is the fourth fusion character (fifth if you count Cell).
 * Gogeta is the fourth movie character to be DLC in Dragon Ball FighterZ.
 * Gogeta is one of the two characters who were introduced in the movie being re-introduced to canon universe alongside Broly.