Obi[]
She was a colleague to Obi at an organization that presumably handled illegal affairs, before he left. She describes Obi as friendly and sociable, but never gets close to anyone, which was better for their line of work. She can faintly remember a time when he was badly injured once; an event that made her think he was dangerous.
In their most recent altercation, Torou did not show signs of any dislike towards Obi and acted playful and casual. She also used him to complete a job without telling him what helping her entailed, namely fighting off guards for her and serving as backup. Obi did not seem surprised by this and even went so far as to save her from falling off a balcony.
Torou seems to be on good enough terms with Obi, judging by their interactions, though the exact nature of their relationship is a mystery. She and Obi have made it clear that they are not romantically involved with each other. Due to Obi's tendency to not get close to people, their relationship seems to be professional.
It's been three years since they last saw each other.