Goku (孫悟空), born Kakarot (カカロット), is a male Saiyan and the main protagonist of the popular anime/manga series. Goku is a Saiyan originally sent to Earth as an infant with the mission to destroy its people. However, an accident alters his memory, allowing him to grow up to become Earth's greatest defender and the informal leader of the Dragon Team. He constantly strives and trains to be the greatest warrior possible, which has kept the Earth and the universe safe from destruction many times.
Super Saiyan Blue (超サイヤ人ブルー), also known as Super Saiyan God Super Saiyan (超スーパーサイヤ人じんゴッド超スーパーサイヤ人じん), is a form that combines the strength of Super Saiyan God with the first Super Saiyan form. This form can be accessed by absorbing the abilities of a god, activating them and then transforming into a Super Saiyan, or through vigorous ki control training with a deity with godly ki and then obtaining that Godly ki for oneself, as seen with Vegeta in the Super anime. This form exceedingly surpasses its predecessor, Super Saiyan God.