Mashiba is one of the most intimidating characters in the series, appearing markedly more hostile and unsociable than most other characters. His intimidating demeanour is usually used for comical effect, as other characters, notably Ippo, are terrified of him. All of this is in complete contrast in character to his sister, Kumi, who is portrayed as light-hearted and sweet. Despite still being very stoic, brash and rude, he seems to have mellowed out later in the series, appearing more often in 