Kei Karasuma is the President of BOARD and Amane's second father. 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.