Kaoru Unagiya

is the young son of Ikumi Unagiya, Ichigo Kurosaki's employer.

The Lost Substitute Shinigami arc
Kaoru wakes up from 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 try an move in on his mother just because she is beautiful. He supports his argument with a raspberry before Ikumi takes him out of the room.