Iori

The master of the Karyuu Martial Arts Dojo in the red-light district.
A man whose past is shrouded in mystery.
He took the protagonist in at a young age and taught her everything she knows.
He's working a side job as a handyman around town, but it's just cover for his true job as a spy.
The type who doesn't show his emotions easily.
He loves smoking and drinking, but is not fond of samurai.