Riku (Saber)

, referred to as just is Touma Kamiyama's adopted son. 
==History==
===Background===
Riku Mamiya was three years old when he lost his parents from one of the Sword of Logos’ battles against the Megid. One night, he ran away from the orphanage and stumbled upon Mumeiken Kyomu. Upon picking up the sword, this split him from his child self and adult self. The child Riku was found at the Fantastic Bookstore Kamiyama's destruction site, where Touma Kamiyama comforted him. His trauma of losing his parents caused Riku to become mute and unable to talk to anyone. Touma would take in Riku as a foster son for the next eight years.
===Kamen Rider Saber: Trio of Deep Sin===
The eleven year old Riku continues to go to school and cared by Touma. Despite being unable to speak, he seemed to have view Lucky as his best friend. However, Riku seems to be still traumatized by fire and knights which triggered frightening memories he doesn't wish to remember, when he see the pages of the Flame Swordman in Wonder Story, the pictures haunts him again until Touma calms him down. While Riku continues to play with Lucky, they are frequently attacked by Kamen Rider Falchion and only saved because of Touma's intervention.
It would be revealed that Mamiya was the one who attacked him, manipulating Touma's life in order to make him suffer a fate worse than death by killing the ones he love. Riku watches as Touma transforms into Kamen Rider Saber, the flame swordsman that he had seen in his nightmares protecting him. However, Mamiya gained the upperhand after Touma began to cease to exist. Not wanting Touma to suffer, Riku tries to muster up the courage to speak out that Touma is his "dad".
However, Riku would stand up against Falchion by picking up Kaenken Rekka in his place. Mamiya would regain his lost memories that he was originally Riku. The young Riku is able to finally talk to Touma for the first time and tells him about his day. After acknowledging Touma as his father, Mamiya uses Amazing Siren’s powers to restore reality back to normal. Before Riku disappeared with Mamiya, they both thank their father Touma.
==Personality==
Riku is quiet and likes Lucky, his companion dog. He has suffered trauma resulting from the loss of his parents. Thus, he panics and becomes afraid upon the sight of fire or a Seiken, in particular the Kaenken Rekka, because of Saber's involvement in the battle which killed his family.
He eventually manages to develop his own courage and overcome his fears after years spent under the care of Touma, whom he begins to acknowledge as his adoptive father.
==Behind the Scenes==
*Riku is portrayed by . His younger self is portrayed by .
==Appearances==
* Kamen Rider Saber
**Kamen Rider Saber: Trio of Deep Sin
==External Links==
to be added
==Navigation==
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