Hideyasu Jonouchi/Potential Timeline

In a potential timeline where the Helheim Forest has taken over the world, Hideyasu Jonouchi (城乃内 秀保) was Kamen Rider Gridon (仮面ライダーグリドン [栗団]), who was part of Baron's faction in the Sengoku Rider War.

History
In an apocalyptic future where the Helheim Forest has taken over the world, Gridon was a member of Baron's faction. As Gaim and Baron's factions charge at each other, Gridon charges after Gaim's army.

Arms
Donguri Arms "Come on! Donguri Arms! Never give up!"

- Transformation announcement

Rider Statistics: Ability Parameters: Donguri Arms (ドングリアームズ) is Gridon's acorn-based default form. Accessed through the Donguri Lockseed, this form bears the Dome Casque (ドームカスク) helmet with the Nut Eye (ナットアイ) visor.
 * Rider Height: 203 cm
 * Rider Weight: 110 kg
 * Punching Power: 8.9 t
 * Kicking Power: 9.2 t
 * Maximum Jump Height: 22 m
 * Maximum Running Speed: 100 m per 6.5 seconds

While assuming Donguri Arms, Gridon dons the Donguri Armor Part (ドングリアーマーパート) and his Arms Weapon is the Donkachi. If Gridon activates his Sengoku Driver's Sparking function, he can temporarily convert the Donguri Armor Part into its nut form and spin it to use as a shield for bouncing off enemy attacks.

In this form, Gridon can throw punches stronger than both Gaim in Pine Arms and Baron in Banana Arms, though his kicking power is far weaker then the aforementioned Riders. As for his jumping height and running speed, they are the same as Gaim's in Pine Arms. Gridon is later further strengthened when his Sengoku Driver is replaced with an updated, refined model.

This Arms has three finishing attacks.
 * Sengoku Driver finisher:
 * Donkachi Giant Rotation (ドンカチ大回転): Gridon activates the Squash function on his Sengoku Driver and spins at high speeds with the Donkachi held out. The spinning forms an acorn projection before Gridon knocks the opponent with a high-velocity hammer slam.
 * Gridon Impact (グリドンインパクト): Gridon activates the Au Lait function on his Sengoku Driver and dives from above and strikes the enemy with the Donkachi.
 * Unnamed Rider Shooting: Gridon activates the Sparking function on his Sengoku Driver and swings the Donkachi, sending a pulse of energy at the target.

Jonouchi loses access to Donguri Arms in a battle against Zack and Yoko, resulting in the destruction of his Donguri Lockseed and Sengoku Driver.

Appearances: Gaim Episode 1 & 44

Devices

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

Weapons

 * Arms Weapons
 * Donkachi - Gridon Donguri Arms' personal weapon

Portrayal
Hideyasu Jonouchi is portrayed by Ryō Matsuda (松田 凌). As Kamen Rider Gridon, his suit actor is Kazuya Okada (岡田 和也).

Appearances

 * Kamen Rider Gaim
 * Episode 1: Transform! The Orange from the Sky!?
 * Episode 44: Two People Aiming At the Future