Later, during the second Wandenreich Invasion, he has received new armor. The new armor is more rounded at the shoulders than his old, and he has received a new helmet, and armor plating for his torso. When he utilizes his Human Transformation Technique, Komamura's appearance becomes closer to that of a Human, which retains his large size. He has long hair in this form, but he still retains his wolf ears and some fur on his forearms.
In contrast to his imposing 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 taking him in; so grateful that he would even die for him. 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. Sajin Komamura has also been shown to be a very forgivable person even if his friend is corrupt, or how evil they are, no matter how many innocent people they've killed, and even if they're about to kill him. 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").
Komamura is also a very serious man, deeply scarred by the times when he was spurned by Soul Society for his appearance. He is not tough or cruel to his Division, preferring to lead them with impartiality. His favorite food is meat, but he dislikes carrots, supposedly because his father once told him that carrots were "not for their kind." Komamura tends to growl when angered. Despite being a gentle person, he is cold, ruthless and calculating when fighting. Once he is done fighting, however, he reverts to his gentle, giant self.
Komamura is pleased with Shūhei Hisagi's gift of a dog brush from the Human World, as he finds brushes in the Seireitei ineffective when grooming 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 breeds, and even keeps one, whose name is 'Goro', in his Division's quarters. During his free time, he takes Goro for strolls. He likes the Human World's puppy shows.
Some time before joining the Gotei 13, Komamura left his family, ashamed of living in the shadows. Although it is currently unknown where Komamura originated, Yamamoto gave him the opportunity to join the Gotei 13 even though he wasn't Human.
One day, while sitting on a grassy area, Komamura was sensed by Tōsen, who didn't know where he was (due to his blindness). It was only when Komamura spoke that he realized he had talked in the wrong direction. Complimenting Komamura’s ability to hide his presence very well, Tōsen noted that he had never been able to not feel someone’s presence before, even though his eyes cannot see. Komamura was highly touched, for this was the first time that he wasn't looked upon as an outcast.
Komamura met Tōsen again during their time in the Gotei 13, and Aizen was introduced to Komamura through Tōsen.