Kawakami Bansai

Kawakami Bansai, also known as Deaf Man (つんぼこと, tsunbo koto) or simply Tsunpo (つんぽ), was a member of the Kiheitai, an extremist Joui faction bent on causing world destruction. Apparently, Bansai serves the Kiheitai as some kind of vice-chief, as he is the only one who's mostly with Takasugi, and is, just as Takasugi, called "Bansai-sama" by all his subordinates and is in charge of the Kiheitai members when Takasugi is absent.