Mitsuya
Admiral Mitsuya was a 24th century Starfleet flag officer. Mitsuya was one of the best poker players in the fleet, next to Jadzia Dax. 

In mid-2370, Mitsuya diverted the  to starbase Deep Space 9 to talk about Cardassian foreign policy. Dax claimed that that was just an excuse to get Commander Sisko in a game of poker because Mitsuya cleaned him out the year before. ()

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Individuals
Starfleet personnel (24th century)
Starfleet flag officers