Ganon

Ganon, also referred to as Beast Ganon or Ganon, The Demon King, is the beast form of Ganondorf and the primary antagonist of the The Legend of Zelda series. He first debuted in the original NES The Legend of Zelda. Ganon is the archenemy of Princess Zelda and Link, and is the king of darkness. Ganon's beast form has seen many visual changes throughout the series, but is always resembling some kind of boar or warthog. The beast form of Ganondorf has appeared in more installments of The Legend of Zelda series than his Gerudo form, and is frequently fought as the final boss.

The Legend of Zelda
In the original The Legend of Zelda television series produced by DIC Entertainment, Ganon starred as the primary antagonist. His goal was to steal the Triforce of Wisdom from Link and Princess Zelda. He was portrayed by the late Len Carlson.

Captain N: The Game Master
Ganon appeared in the episode "Quest for the Potion of Power" of Captain N: The Game Master. He borrows his appearance and personality from The Legend of Zelda TV series, and is also portrayed by Len Carlson.

Super Smash Bros. Brawl
Ganon appears as Ganondorf's Final Smash in Super Smash Bros. Brawl, where he is called "Beast Ganon." He is based on his beast form from The Legend of Zelda: Twilight Princess.

Super Smash Bros. for Nintendo 3DS / Wii U
Ganon returns as Ganondorf's Final Smash in both Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, with the same look and name as the previous installment.

Super Smash Bros. Ultimate
Though Ganon returns as Ganondorf's Final Smash in Super Smash Bros. Ultimate, this time he is based on his appearance from The Legend of Zelda: Ocarina of Time. He is also called "Ganon, The Demon King" in this installment, and functions slightly differently from Ganondorf's previous Final Smash. In addition, Ganon appears as a boss in both Classic Mode and in the Adventure Mode: World of Light. For Classic Mode, he is fought as the final boss for Link, Young Link, Toon Link, and Zelda.

Nintendo Land
Ganon is fought as a boss in Nintendo Land, in the The Legend of Zelda: Battle Quest attraction.

Trivia

 * Coincidentally, both Ganon and Bowser had their designs partially derived from the Chinese folk tale Journey to the West (with Ganon being based on Zhu Bajie, the humanoid pig character, while Bowser was partly based on the Ox King Gyū-Maō).