Tsukiumi

Tsukiumi is one of the heroines of the story and Minato's fourth Sekirei. She first appears to Minato in a dream saying that she would kill him; this was due to her desire to be the strongest Sekirei without being winged by an Ashikabi as well as her misunderstanding how a Sekirei emerges (she was under the impression that she would have to sleep with the Ashikabi.) When they finally met, she was persuaded into becoming his Sekirei. She refers to herself as Minato's 'legal wife' and is very possessive of him. Tsukiumi had a one-sided rivalry with Homura, whom Tsukiumi considers her rival (she was apparently defeated by Homura on their very first confrontation; he then advised Tsukiumi to find her Ashikabi instead of wasting time fighting, and Tsukiumi has been looking forward to settling the score ever since). Tsukiumi once confided to Asama Miya that she still wants to be the strongest, but it is so she can be with Minato forever. Her name (Tsuki + umi) literally means "moon sea" (not to be confused with "lunar mare" - 月の海).