Konmei Eikyuu

Konmei Eikyuu (永久=混迷, Eikyū Konmei) is a former Captain of the Gotei 13. After being sent to the Maggot's Nest because of voicing her concerns about the Central 46's actions, she fought her way out and escaped to parts unknown. Recently resurfacing, Konmei has become the serial killer that lurks around Seireitei at night. She mainly excecutes those she deems 'evil', or those who have escaped justice, in her terms; "they must recieve their punishment, as the authorities have let them escape it".

Zanpakutō
Xuèsèyǔ (血色羽, "Bloody Feather") is the name of Konmei's Zanpakutō.