Isaac

Isaac (ロビン, Robin in Japanese language versions) is the main protagonist of Golden Sun for Game Boy Advance, and also plays a strong role in its sequel; Golden Sun: The Lost Age. His appearance as an Assist Trophy in Super Smash Bros. Brawl is his first appearance in 3D, as well as the first appearance of Golden Sun in any format since 2002.

Isaac is a strong-willed young man and swordsman who is classified as an Adept of the Venus element, which means he can conjure sorcerous powers based on earth and plant matter. These powers in the Golden Sun world are called Psynergy. He made his first appearance in the Camelot developed RPG title, Golden Sun, in which he sets out to prevent a band of antagonists from unleashing a powerful and potentially dangerous force called Alchemy upon the world of Weyard. He is a silent protagonist in the first Golden Sun, but is depicted as speaking normally in the sequel, Golden Sun: The Lost Age, since the game places a different Venus Adept warrior in the role of the game's silent protagonist, Isaac's rival Felix.

In Super Smash Bros. Brawl
Isaac was heavily anticipated to be a playable character by the Smash Bros. and Golden Sun communities, and the lack of his appearance in the game's final roster came as a disappointment to many. However, his appearance as an assist trophy, the inclusion of music from the Golden Sun series and the confirmation by Camelot that they intend to return to the franchise in the near future give him high chances for the next title in the Smash series.

As an Assist Trophy
When he appears, he uses what is normally a non-battle utility, a Psynergy spell called "Move" as his in-game battle effect, which creates an energy field in the shape of a giant hand three times in total that pushes foes away and off the stage from both sides of him.