Shūichi Natori belongs to a family with a long tradition of practicing exorcism. As an exorcist operating within professional supernatural circles, he maintains a formal approach to his work and occasionally collaborates with others on youkai-related cases. His interactions with the protagonist involve sharing knowledge and resources related to spiritual matters, reflecting a pragmatic yet subtly protective dynamic.

In official media, including the movie "Ephemeral Bond," he assists investigations into mysterious youkai activities. His expertise contributes to resolving conflicts involving spirits. His established role is that of a supporting figure and exorcist ally within the documented materials.