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Sajin Komamura (狛村 左陣, Komamura Sajin) is the captain of the 7th Division. His lieutenant is Tetsuzaemon Iba.

In contrast to his physical stature, Komamura has a heart of gold, as well as being a loyal and grateful subordinate to Captain-Commander Genryūsai Shigekuni Yamamoto, to whom he owes great gratitude for overriding the rules of Gotei 13 and taking him in; so grateful that he would even die for him. Komamura is also a serious man, deeply scarred by the times when he was spurned by Soul Society for his appearance. Like fellow Captains Jūshirō Ukitake, Shunsui Kyōraku, and Retsu Unohana, he isn't tough or cruel to his squad, preferring to lead with them impartiality.

An omake shows Komamura being pleased with the gift of a dog brush from the human world, as he finds brushes in Seireitei ineffective at brushing his fur. In addition, Iba imagines that Komamura will possibly use a dog Gigai if he were to go undercover in the Human World. He also likes dogs, especially ones of mixed breed, and even keeps one, whose name is 'Goro', in his squad's quarters; During his free time, he takes Goro for strolls. In a Shinigami golden segment, it's revealed that he likes the Human World's puppy shows.

His favorite food is meat but dislikes carrots, supposedly because his father once told him that carrots were "not for their kind."Komamura tends to growl when angered, and in an omake, Komamura responds to Wonderweiss screaming by howling back.

The betrayal and subsequent departure of his close friend, Kaname Tōsen, may have adversely affected his self-confidence and view of himself, since Tōsen was the first person to have accepted him for who he is and not what he is. This adverse effect is shown when he describes himself to Choe Neng Poww as "a meager worm" (he may have been speaking in sarcasm, however, as Poww previously referred to him and his opponents as "worms").

Despite being a gentle person, he is cold, ruthless, and calculating when fighting. Once he is done fighting, however, he reverts back to his gentle, giant self.