BOARD

Short for the "Board Of Archaeological Research Department", BOARD uncovered the seal Undead Cards and developed the first two Rider Systems.

Kei Karasuma
Kei Karasuma (烏丸 啓) is the President of BOARD. A 48-year-old professor who created the Rider systems 01 and 02 (Garren and Blade), as well as the Leangle System (03), while he was under control of Isaka. During his travels, he befriends Noboru Shima, whom he entrusted the Rouze Absorbers to despite knowing he was an Undead. He is also aware of the side effect of Kenzaki's King Form as well as Tennoji's plans of the fake Battle Fight. 4 years after the series end he and Tachibana tried to cover 52 cards, when Albino Joker appeared and unsealed Undeads, who attacked and killed Karasuma.

Yoshito Hirose
Yoshito Hirose (広瀬 義人) is Shiori's father, the one responsible for breaking the Undead's seal in a fit of madness, dying in the process. He created the Trial-series Undead Trial B (トライアルＢ) in his image to protect Shiori, possessing all his creator's memories. However, Trial B was reprogrammed by Tennōji to continue to monitor the fixed Undead battle and remove potential threats before he sacrifices to protect Shiori from Trial G.

Hiroshi Tennoji
Hiroshi Tennoji (天王路 博史) is the chairman of BOARD who intentionally set up the series of events in the fake Battle Fight and the creation of the Category Ace Kerberos, so that he could have his warped dream of a new world order with himself as its ruler. In the end, he was murdered by the Giraffa Undead after he was defeated by the Riders with his dreams shattered.