Fake Mekira. Learned the ways of Shikage Ryuu alongside Benitora sometime in the past.
Mekira killed his master because he would not teach Mekira the school secrets.
Once he became Juunishinshou, he faced Benitora in Aokigahara and was killed after Benitora realized the power of the Shinkage, ripping out half of Mekira's stomach.
