|This article is about a/an character in Kamen Rider Blade.|
- "Tachibana, it's my fault that your body has become like this...but I won't apologize."
- ―Karasuma's infamous quote[src]
Kei Karasuma (烏丸啓 Karasuma Kei) is the President of BOARD and the 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 Rouse Absorber 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.