He`s the person that deducts your SeeD`s rank heavily for violating the rules of Balamb Garden. He`s exceptionally rare because you don`t see him that often in the game.

Anyway, his name is displayed as Instructor Aki in the game. I wonder why Aki? I checked the Wikipedia for this special character and it shows ヤマザキ先生, Yamazaki-sensei. So, Yamazaki. Noticed anything strange? I believe that his name is actually Yamaz Aki, hence Instructor Aki.

Hmm ...