Suou was a young man with short hair.
Suou worked as the exorcist for Komiya where he was appointed by Honoka and partnered with Kotetsu. Suou often spoke about working as an exorcist to achieve an ordinary life for his sister and often spoke appraisal of Kotetsu to her.
Suou was killed by an amasogi, prompting Sunao to seek revenge while blaming Kotetsu for failing her brother.
- Suou's surname Sumeragi means "emperor" (皇).