Masumi is blunt, and always speaks his mind. He doesn't mince his words, speaking on how he feels about people and their behaviors, stating that he hates "wishy-washy people". He doesn't go easy on students. He’s easily annoyed, yet never shows it on his face, which always has a smile. He has no trouble being rude and taunting people for their lack of intellect or arrogance, He takes his job very seriously, and does not like anyone who’s unserious about it. He’s 5’4. He’s short.