Isaac (ロビン, Robin) is the main protagonist of Golden Sun for the Game Boy Advance. His appearance as an unlockable Assist Trophy in Super Smash Bros. Brawl is his (as well as any Golden Sun character's) first appearance in 3D, the first time his voice was heard (being, again, the first appearance of any Golden Sun character's voice as well) and was the only appearance of Golden Sun in any official format between 2002 and 2010.
In Super Smash Bros. Brawl
As an Assist Trophy
When Isaac appears, he uses a Psynergy spell called "Move", as his in-game battle effect, which creates an energy field that pushes foes away and off the stage. If the player is hit by Move, it can be difficult to escape. Isaac will turn to face enemies during this attack should they attempt to evade. However, like in the Golden Sun series, the move does no damage. Isaac performs Move three times before vanishing.
Unlike many other Assist Trophies, Isaac can affect invincible opponents, since his Psynergy pushes the opponent and does no damage. If the Psynergy makes contact with a Smash Ball, the sound of the Smash Ball being hit will play, along with its visual effects.
To unlock Isaac, players must play 200 matches to completion.
A strong-willed Psynergy adept of the bloodline of an ancient race thought to have been lost with the downfall of civilization. He can manipulate earth-based forces and is also a highly skilled swordsman. He sets out to protect a lighthouse that can release the sealed powers of alchemy. In Smash Bros., he uses "Move" Psynergy, which creates an energy field that pushes foes away.
Isaac originally appeared in Golden Sun, an RPG-style game for the GBA. The game focused on Isaac and friends' quest to retrieve the four elemental stars and stop the return of Alchemy, following their theft by the games' first two antagonists, Saturos and Menardi. Isaac is the main playable character in the game, and he is one of the four playable characters capable of wielding Psynergy, a form of mind power. Isaac is a Venus Adept, meaning he can manipulate Earth and plants. As the game progresses, Isaac and friends gain access to a wider variety of Psynergy necessary to progress through the game.
Isaac returns in the game's sequel, Golden Sun: The Lost Age, but instead appears as one of eight party members led by the game's protagonist, Felix. This game explains the story from Felix's point of view, and focuses on Felix and the full party as they are forced to return the flow of Alchemy to save their parents' lives, which are being threatened by the game's new antagonists, Karst and Agatio, as they continue what Saturos and Menardi could not after their death in the first game.
He also briefly appears in the most recent game in the series, Golden Sun: Dark Dawn, this time as the father of the main character, Matthew. While joining Matthew's party in the beginning of the game, he is not seen for the rest of the game's plot.
The Psynergy that Isaac uses in Brawl is called Move. It is a Utility Psynergy - that is, it cannot be used in battle, and it is acquired virtually at the start of the game. "Move" is used primarily to move heavy objects to solve puzzles. The use in Brawl is somewhat different; while it does move obstacles, it simply pushes them away in order to achieve a wide variety of different ends.
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