Kyouichirou Tachigi is a character from the anime The Skull Man, depicted as an older man with gray hair cut to ear length and brown eyes. His appearance often includes large eyebrows and a hat.

Within the narrative, Tachigi serves as a detective. His role in the story is closely tied to the central mystery surrounding the Skull Man. As an investigator, he is perceptive enough to connect Hayato Mikogami, the series' protagonist who takes on the Skull Man identity, to a deeper, hidden past. Tachigi speculates that Hayato might actually be Tatsuo Kagura, a figure with a significant and mysterious history linked to the events of the plot. This suspicion establishes Tachigi as a character who sees beyond surface-level identities and pursues the truth behind the Skull Man phenomenon.

The search results do not provide detailed information regarding his personality, his primary motivations, other key relationships beyond his professional suspicion of Hayato, his character development over the course of the series, or any notable abilities he might possess.