Kei is quite the unfazed and silent type of person.. And a huge introvert, he is also quite a very sarcastic and stoic person.. Kei also often speaks rude, cold and mean that sometimes people doesn't even know if he was joking or being serious given that his voice sounds sarcastic but his face seems serious and stoic.. Kei is quite an intelligent honor student but he doesn't like joining school activities, especially when it involves crowds and noise