Kougane

"I am the God of the New Generation!"

- Kougane, in its male form, telling Kouta who "he" is

Kougane (コウガネ), or Kogane in different publications, is Kamen Rider Mars (仮面ライダーマルス), who is the main antagonist in Kamen Rider Gaim: The Great Soccer Match! The Golden Fruit Cup!. It later returns in the series finale as the female Kamen Rider Jam (仮面ライダー邪武 [ジャム]), serving as the series' final villain.

Golden Fruit Cup
Kougane is the manifestation of an artificial Golden Fruit created by the Over Lords in the past. When an experiment by Ryoma goes wrong, Kougane awakens and kills Ryoma. Kougane's existence causes the Armored Riders to lust after each other for the "Golden Fruit". Slowly, the Armored Riders start to kill each other off as Kougane masquerades as Yuya to get to Kouta. The deaths of the fallen Armored Riders strengthens Kougane's "Golden Ringo" Lockseed. When it is revealed that he is not really Yuya, Kougane transforms into Armored Rider Mars and defeats Kouta. Corrupting Kouta into Kouta-Yami, the two go after Lapis. However, Ryugen, Baron, and Marika interfere, with Lapis disrupting the mind control on Kouta. Kouta transforms into Gaim Kachidoki Arms and chases Mars in a fight that ultimately allows most of the deceased Riders, whose heart was not fully corrupted like Sigurd and Duke, to return to aid Kouta. Mars emerges with a flaming horse and is defeated by the Armored Riders as the world returns back to normal, also resulting in Lapis' disappearance.

Post-Helheim Invasion
Somehow, time is distorted once more as Kougane appears through a time rift six months after the Helheim plants and Inves were removed from Earth. Possessing a teenage girl, Kougane seeks out the remaining Armored Riders. Defeating Kurokage, he fights against Mitsuzane. However, he is cornered in the fight and uses the human body he is using as leverage. However, Kouta appears and forces Kougane out of the girl's body. Kougane is killed by Mitsuzane and Kouta.

Arms
Like with the other Lockseed-using Kamen Riders, Kamen Rider Mars/Jam's forms are called Arms (アームズ).

Devices

 * Sengoku Driver - Transformation device
 * Lockseeds - Gives access to Mars/Jam's Arms changes, depending on which lock is used.

Weapons

 * Mars:
 * Arms Weapons - Weapons that come with the Arms:
 * Sword Bringer - One of Mars Golden Arms' personal weapons
 * Apple Reflecter - One of Mars Golden Arms' personal weapons
 * Jam:
 * Musou Saber - Side weapon
 * Arms Weapons - Weapons that come with the Arms, besides the Musou Saber:
 * Daidaimaru - Jam Darkness Arms' personal weapon

Portrayal
Kougane is portrayed by Kataoka Ainosuke VI (六代目 片岡 愛之助). In the series' finale, Kougane is portrayed by {{nihongo|Honoka Ando|安藤 穗乃果}Ando Honoka}}.

As Kamen Rider Mars, his suit actor is Yasuhiko Imai (今井 靖彦), who also serves as the suit actor for Kamen Riders Bravo and Kurokage (Ryoji Hase). As Kamen Rider Jam, her suit actor is currently unknown.

Legend Rider Lockseeds

 * The following Legend Rider Lockseeds are styled for Mars, as well as Zangetsu:
 * Stronger - "Aku wo Taoese to Ore wo yo Bu!"
 * ZO - "Daijizen Neo Seimeitai!"
 * Agito - "Mezamero, Sono Tamashii!"
 * Ryuki - "Tatakawanakereba Ikinokorenai!"
 * Hibiki - "Tatakikome Kiyome no Oto!"
 * Momotaros - "Ore Sanjou!"
 * Fourze Cosmic States - "Minna no Kizuna de Uchuu wo Tsukamu!"