Ganon, also known as Ganondorf Dragmire in his human form, is the main antagonist of The Legend of Zelda series. Ganon is often the possessor of the Triforce of Power, giving him immense strength. Despite Link defeating him in every game he appears, evil always finds a way to bring him back. It is said that you can't fully kill a man who holds the Triforce of Power. His motives for being evil differ from game to game, but he is always out to get all the pieces of the Triforce to take over the world of Hyrule. Although Ganon is the main antagonist in the series, he does not appear in every game, one example being The Legend of Zelda: Majora's Mask.
The pig like beast, Ganon, was introduced in the first Legend of Zelda game, but the man Ganondorf wasn't introduced until Ocarina of Time, in which he transformed into Ganon during the final boss battle.
In Twilight Princess, the sages attempted to execute Ganondorf, but failed because of his divine power. Ganondorf killed one the sages, which forced them to send him into the twilight realm. There, Ganondorf appeared before Zant, posing as a god and granting him part of his power. He holds onto the sword used in his attempted execution and uses it to fight Link at the end of the game and while it didn't kill him, it certainly left a scar. He is also a fighter in Super Smash Bros. Melee & Brawl in his human form.
In the Super Smash Bros. series
Ganon appears in his human form, Ganondorf, in the Super Smash Bros. series, starting with Super Smash Bros. Melee. He is a semi-clone of F-Zero pilot Captain Falcon.
Super Smash Bros. Melee
In Super Smash Bros. Melee, Ganondorf kept many traits held by Captain Falcon, most notably the speed of his Smash attacks. His moves are almost totally identical to Captain Falcon in every way, except for his forward aerial and his standard attacks. He is currently a high tier character.
Super Smash Bros. Brawl
In Super Smash Bros. Brawl, Ganondorf was made less of a semi-clone, but he still fell on the tier list with Captain Falcon, and is currently the worst character. He was based on his model from The Legend of Zelda: Twilight Princess, and because of this fact, he looks and acts older. His dashing speed is much lower, and he has even slower moves. Since L-canceling was removed, his aerials, if not auto canceled, keep him open.