Asai Takahiko is a former member of the FBI who was singled out to join the Hana-Gumi by Mutou Renji.

He  served as the bridge between the two groups after Butcher was defeated by Hana Tsukishima. However, as the F.B.I. was never formally absorbed into the Hana-Gumi, Asai, along with Renji eventually led what became known as the Hana-Gumi's shadow force.

A silent and extremely reserved fellow, Asai soon became outed as a pervert by fellow Hana-Gumi members Yaita Ikumi and Murakawa Katsuhiro, much to his dismay.