Keiichi Claude Akemi is a long-time Mori Academy student who's been there since middle school. He's best known as the captain of the Yarichin Club and a tachi specialist—basically the guy who takes the lead in most situations, though he's comfortable letting his partner take over when it comes to more intimate moments. He's openly gay and in a relationship with Itome.
As for personality quirks, he's got a pretty straightforward taste in hobbies (adult websites are his go-to) and apparently has a real knack for kissing. He's halfblood and has pretty specific food preferences—eclairs are his thing, while octopus is firmly off the menu.
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