Mikami Kuramitsu (九羅密 美守) is the headmaster of the Galaxy Police Academy, appearing in the OVA continuity's spinoff Tenchi Muyo! GXP. She is the older sister of Head GP Marshall, Minami, aunt of Mitoto and great aunt of Mihoshi and Misao, as well as the granddaughter of Washu Hakubi. Mikami is a high ranking member of the Kuramitsu family, which is lead by her father, Mikumo, until his apparent death during the events of the GXP novels, after which she seems to become head of the family. She is known to be strict but fair. She appears in the OVA, in order to charge her brother, her great-nephew, and Mashisu, for attacking Tenchi and for the Chobimaru incident.
It is revealed in OVA 4 that Mikami's middle-aged appearance is an illusion, though the GXP novels indicate it is a separate body she controls while at work, and that her real appearance is that of a woman in her late twenties or early thirties, with a figure rivaling or surpassing her niece and great-niece's. She also shows an interest of a romantic nature in Seina, suggesting that, after his graduation, she may attempt to sleep with him.
Background information released by the author has revealed that when not hiding behind her public persona, she's very similar to Airi, in that she loves messing with people. The GXP novels indicate that, when she was young, Mikami and Seto dated, and the pair are still on good terms.