|Base of Operations||Karakura Town, Japan, Human World|
|Relatives||Ikumi Unagiya (Mother)|
|Manga||Volume 49, Chapter 426|
Kaoru is a young boy, appearing to be around ten years old. He has mid-length hair with bangs between his eyes and next to his ears. He is usually seen wearing a white t-shirt and blue shorts.
Kaoru is fairly petulant, though he appears to be protective of his mother, and distrustful of other males when they come near her, warning them not to ingratiate themselves with her. However, he has been shown to warm up to the presence of another male if he is in good graces with his mother, as shown when he starts trusting Ichigo after his mother shows a more caring side towards him.
The Lost Substitute Shinigami arc
Kaoru wakes up to hearing his mother yelling at Ichigo. He walks barefoot into her office, despite not being allowed to do so, and complains that he is hungry. When he sees Ichigo in the office, he asks him what he is doing there and tells him not to make a move on his mother just because she is beautiful. He ends his argument with a raspberry before Ikumi takes him out of the room.
When Ichigo returns to the shop late one evening, Kaoru eavesdrops on his conversation with Ikumi. He hears her complaining about Ichigo missing work and asking for more time off. He also hears her trying to reassure Ichigo, and gives Ichigo his trust.