Kirie Monsan

Kuu (クー) is the name given by Era Saga to the previously-nameless Enmi girl wandering throughout Watahama City. Unlike her brethren, she has been purified of the Nasi's taint since birth and therefore displays traits akin to that of a Full Caste (though she lacks their ability to transform). She also remains the only Enmi who can pass through the protections surrounding Kane Shrine with no issue.

Originally an impassive observer drawn to Kamen Rider Nio's fights, she later becomes an outright ally to the Riders and offers them insight into the Inner Circle's greater plans.