|This article is about a/an character in Kamen Rider Black.|
Katsumi Kida is Nobuhiko's girlfriend, like Kyoko she is not aware of Kohtaro being Black himself until Kyoko tells her the truth about Kohtaro. Once Nobuhiko emerges as Shadow Moon, she was also terrified of his new appearance. She assists Kohtaro quite a few times to persuade Shadow Moon to remember his human-side. After the defeat of Shadow Moon at the hands of Black, she and Kyoko left Japan to start a new life abroad.
- Naomi is Katsumi's Filipino dub name.