Kei is very blunt, considering himself lower than others & will sometimes anger the team/enemy due to his easygoing arrogant attitude. Whenever someone does/says something stupid/silly, he can usually be seen chuckling in the background. For him volleyball was just an extra but then he really liked it. Shows little emotion, but looks very annoyed when people belittle/tell him what he can/can't do & use that as motivation to prove them wrong. Actually he's a very hardworking, tsundere & kind boy.