Ganon
Ganon, also known as Ganondorf, is the main antagonist of The Legend of Zelda series. He has been present or at least referred to in the first five games of the series, and has subsequently been in three more after. Throughout the series, Ganon has had several deaths, both confirmed, like in Legend of Zelda, and unconfirmed, as in Twilight Princess. Ganon possess the Triforce of Power, which contains the essence of the Goddess Din. This divine power makes Ganon unimaginably strong and grants him boundless power, making him the largest threat to Hyrule in all its history. As stated in the prophecy of Hyrule, the only one capable of defeating Ganon is the Hero chosen by the Goddesses.
History
Throughout the games, Ganon's intentions haven't changed. Taking the triforce of power or earning it and spreading darkness over Hyrule, And he often kidnaps Zelda in the process. Only his appearance has changed, He is blue and a pig-monster in LoZ while in OoT he is a gerudo and eventually turns into a giant, green monster. Ganon and Ganondorf aren't the same person, Ganondorf is the human/gerudo version while Ganon is the abomination, beast or demon version of Ganondorf.
Trivia
. In The First Game for the NES (The Legend of Zelda) Ganons name was spelled Gannon.
As the single male Gerudo born to the Gerudo Tribe every hundred years, Ganondorf was born the king of his people. He is a power hungry thief and sorceror seeking to find the omnipotent Triforce and use it's power to take over Hyrule. Ganondorf is willing to use any means to achieve his goals, including treachery towards the King of Hyrule and manipulation of his own people.