Bairen Guile

Bairen Guile is a Rokushiki and Haki Development System instructor.

History
Guile trained Umori Kenshiro since he was 8 years old, and molded him into a powerful weapon for the Government. He also taught him swordsmanship and Haki, although he left most of his sword training to Quarha Jaina.

He also acted as Umori's only parent figure, and often left the curious child pursue his scientific endeavors on his free time. He is also one of the few people who know about Kenshiro's real parents.