Sorry i'm not good at remembering Japanese names so who is Rogi?

The right-hand man of Tatsuyuki's father. Tatsuyuki often jokes about him by calling Rogi his "mother" and he also took care of Nozomi-sensei after the incident with his father.

Noooo, not correct. You're thinking of Asoda. That's the one like his mom.

Rogi is the creepy older guy who kept Tatsuyuki in his house in bondage and whatnot in http://www.mangago.zone/read-manga/yondaime_ooyamato_tatsuyuki/