Ren Aoi

"The Kamen Rider who holds the power of 15, Fifteen."

- Ren introduces himself to Gaim.

Ren Aoi (葵 連) is a mysterious man, who transforms into Kamen Rider Fifteen (仮面ライダーフィフティーン), created by the Badan Empire in order to defeat the Kamen Riders. He is the father of Shuu Aoi and husband of Saki Aoi.

Past
Ren Aoi is a family man when his son was alive. After his son died in an accident while having to do with meeting his wife at a lighthouse, Ren falls into despair after losing his son. When his son is in fact alive, Ren joins the Underground Empire Badan, becoming their Kamen Rider to find his still alive son, but somehow got brainwashed into their pawn.

ToQger vs. Gaim
"Soon the moment the world is overthrown will arrive. And that will be when my ambition is fulfilled!"

- Fifteen makes his vow on the eve of war

Kamen Rider Fifteen first appears to fight the ToQgers, but is interfered by Showa Riders 1, 2, and V3. The three riders manage to drive off Fifteen, as he enters through a darker version of a Helheim Crack. During the post-credits scene, he foreshadows the events of Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai.

Heisei Rider vs. Showa Rider: Kamen Rider Taisen
After finding his son at Zawame City, Ren appeared in his normal identity, battling Gaim, Baron, Ryugen and Zangetsu Shin, transforming into Fifteen, able to defeat Zangetsu Shin then later Ryugen, thanks to Heisei Rider Lockseed he use as Wizard Arms. His battle with Gaim is interrupted by three very first Showa Riders, leading Gaim to escape with Shu and Mai to safety. He found his son again in his home destroying the message that Shu made for his mother and tells him to come in order to use Shu's power for the Mega Reversal Machine. However, his son refused because Ren began to act strangely due to him being brainwashed, thus leading to Ren forcing his hand to take him away from Heisei Riders' protection. Upon his son finally caught nearby the lighthouse where his wife, Saki is, Fifteen managed to take his son away from the Heisei Riders and meet his wife. He is defeated by Kamen Rider Gaim 1 Arms after he was overpowered by his 1 Squash, destroying his Sengoku Driver and its Yomimaru, thus freeing him from Badan's grasp. After realizing for what he did when he was brainwashed by Badan, his son began fading away, but managed to take his son to the lighthouse to reunite with his wife, thanks to the Riders (mostly Showa Riders' Rider Syndrome teleportation) and seeing their son disappear to the top of sky as a light above them.

Arms
Like his fellow Armored Riders, Kamen Rider Fifteen's forms are called Arms (アームズ). His Sengoku Driver plays American rock & roll music and emits a guitar riff sound before every transformation. But instead of normal fruit or nut Lockseeds, Fifteen uses the Heisei Rider Lockseed to channel the Legend Rider Lockseeds, allowing him to use the powers of the 15 Heisei Riders.

By pressing the Sengoku Driver's Cutting Blade down on the Lockseed after transforming from one to three times, Fifteen can activate one of three finishing moves based on his current Arms form: Squash (スカッシュ), Au Lait (オーレ), or Sparking (スパーキング). }}

Devices

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

Weapons

 * Yomimaru - Personal weapon both untransformed and in any Arms
 * Arms Weapons - Weapons that come with the Arms:
 * Ride Booker - Fifteen Decade Arms' personal weapon
 * Ongekibou Rekka - Fifteen Decade Arms' personal weapons channeling Hibiki's power
 * Elek Module Billy the Rod, Cosmic Module Barizun Sword - Fifteen Fourze Arms' rotating personal weapons
 * WizarSwordGun - Fifteen Wizard Arms' personal weapon
 * Daidaimaru - Fifteen Gaim Arms' personal weapon
 * Musou Saber - Fifteen Gaim Arms' side weapon

Portrayal
Ren Aoi was portrayed by Itsuji Itao (板尾 創路), who previously portrayed Spider in Kamen Rider The First.

His suit actor is Kenji Tominaga (富永 研司), who is previously the suit actor for the Kamen Rider Bujin Gaim and Ogre Phantom in the previous movie. Tominaga also served as suit actor for Kamen Rider Duke in Kamen Rider Gaim series.