Ookami-Otoko, also known as Wolfman, is a werewolf and key companion to Tarou Kaibutsu, prince of Monster Land. He journeys alongside Tarou, Dracula, and Franken from Monster Land to the Human Realm. During their stay there, he serves as the group's dedicated housekeeper and cook.

His speech consistently features the distinctive verbal tic "gansu" at the end of sentences. Personality-wise, he focuses on practical duties, handling domestic tasks and maintenance for the group. When confronting threats like assassins from the demon group Demonish, he joins battles to protect his companions or defend their mission.

Originating from Monster Land, he pledges loyalty to the Kaibutsu Daiō, Tarou's father. His character design adheres to a traditional werewolf appearance, with no further details on his lineage or personal history beyond his royal service. This portrayal remains uniform across the original manga, 1980s anime, and 2010 live-action television drama, where actor Ryuhei Ueshima embodies the role. No significant character evolution, backstory revelations, or role changes occur in these adaptations.