Ryūji Keikain is Yura's older brother who also a strong Onmyouji. He use water type of shikigami.
Ryūji Keikain is a quite skilled Onmyoji who's doing travel with his partner, Mamiru Keikain. He always refer Yokai as Black, while Onmyoji as White where he believes the world is divided into Black and White. He is also a big brother of Yura Keikain.
Ryūji Keikain was created by Hiroshi Shiibashi. On the Anime, he make his first debut on Episode # 02 of Nurarihyon no Mago : Sennen Makyou. He was voiced by Katsuyuki Konishi. While on the Manga, he make his debut on Act # 51.
Major Story Arc
Ryūji made his first appearance in Keikain Arc. He and his trusted partner, Mamiru Keikain came to Ukiyoe Town to send message to his younger sister, Yura Keikain. While both of them searching for Yura, they encounter two Yokai who claim themselves as Aotabou and Kurotabou. Both Yokai was defeated by the two Onmyoji.
Not long after he defeat the two Yokai, the real Aotabou arrive and both began to fight and leaving Aotabou unconscious and later found by Kurotabou.