Seijuro Mikoshiba (御子柴 清十郎 Mikoshiba Seijūrō) is the captain of the Samezuka Academy swimming team.
Seijuro has slicked back, bright red hair and golden eyes. He is well-built from swimming and other exercises done at Samezuka Academy.
Seijuro is an enthusiastic person, and seems to be instantly attracted to cute girls, like Gou. It is revealed that his room is full of Gou's photos when Haruka, Makoto, Nagisa, Rei and Gou went to visit Rin's room, but accidentally entered Seijuro's.
Seijuro reads Monthly Muscle Magazine, just like Gou does.
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Seijuro has a noticeable crush on Gou after their first meeting. He is always eager for opportunities to speak to her, shown by his enthusiastic acceptance of an idea of a joint swim practice with the Iwatobi swim team. His attempts to go on a date with her are often thwarted by Rin. He usually calls her 'Gou-kun', much to her dismay.