Ma-kun, whose real name is Masashi, is a supporting character in the anime Magical Sempai. He is a transfer student who enrolls at the same school as the main characters. He is also the younger brother of Saki-chan, another female student at the school. Along with his sister, Ma-kun decides to join the Magic Club, the central setting of the story. In terms of personality, Ma-kun is mostly reasonable and calm. He tends to take a level-headed approach to situations, similar to the male protagonist known as Assistant. He does not get easily flustered, even when the club's antics become chaotic. His motivations are not deeply explored, but he chooses to be part of the Magic Club alongside his sister, suggesting a sense of family loyalty and a willingness to participate in the group's activities. Within the story, Ma-kun serves as a supporting member of the Magic Club, often observing the proceedings with a composed demeanor. His key relationships are primarily with his sister, Saki-chan, and the other club members, including the title character Sempai and Assistant. His bond with Saki-chan is a notable aspect of his background, as they join the club together. Ma-kun does not undergo significant visible character development over the course of the series, remaining a steady presence. One of his notable abilities is his interest in psychology and behavior analysis. This interest sets him apart and gives him a unique perspective among the group, though it is not prominently showcased in his actions. Overall, Ma-kun is a calm and observant figure within the Magic Club, defined by his familial connection to Saki-chan and his composed personality.