Mibuchi is pretty uptight. He likes to keep things in line and gets annoyed easily when others fool around or act weird. He criticizes them and tries to correct them, although not always successfully.[1] Despite this, his personality itself seems to be cheerful and relaxed, shown by his good-natured way of lecturing the Seirin High's second years of how to treat a lady (Riko Aida, in this case), and his affectionate nickname of "Sei-chan" for Seijūrō Akashi.[2] While talking he uses "onee-kotoba