Daiki Kaito
Daiki Kaito (海東 大樹, Kaitō Daiki?) is a mysterious young man who travels through the Kamen Riders' worlds in the hunt for their treasures as Kamen Rider Diend (仮面ライダーディエンド, Kamen Raidā Diendo?), possessing the power to summon Riders to serve him. He seems to know more about Tsukasa than Tsukasa himself does, being an ally one minute and an enemy the next when it suited his thieving needs. He first reveals himself to Tsukasa during his travels to the World of Blade, and reveals that he is Diend while in the World of Faiz, following Tsukasa and the Hikari Studio ever since. Prior to the beginning of the series, Daiki had left his home world (World of Diend) for crimes he committed there, only to return when the Hikari Studio group finds its way there.
Daiki Kaito is portrayed by Kimito Totani (戸谷 公人, Totani Kimito?).
Read more about this topic: List Of Kamen Rider Decade Characters