Matsuemon Tennouji serves as the Kasugai crow assigned to Tanjiro Kamado within the Demon Slayer Corps. He is a male crow possessing a full name, an uncommon trait reflecting his self-given identity rather than accepting one from Oyakata-sama or Tanjiro. His initial characterization emphasizes intelligence paired with a notably abrasive and proud demeanor; he exhibits a large ego, openly scorning Zenitsu Agatsuma's behavior during their first meeting and viewing Tanjiro as his disciple. Despite this outward arrogance, underlying warmth and loyalty define his core nature, particularly his dedication to supporting Tanjiro's missions. While each Kasugai crow receives a childhood name from Oyakata-sama and typically adopts a second name upon assignment, Matsuemon uniquely self-selected his full name, rejecting convention. His primary duty involves delivering mission directives and critical information to Tanjiro, a role he executes efficiently despite occasionally rough or off-topic commentary. His relationships reveal further dimensions. He maintains a noted rivalry with Hashibami, Genya Shinazugawa's crow. His most significant development follows the battle against Muzan Kibutsuji. Ginko, the crow formerly assigned to the deceased Muichiro Tokito, falls severely ill due to grief. Matsuemon provides sustained comfort and support during her recovery, demonstrating unexpected compassion. This bond deepens, culminating in their marriage, highlighting his capacity for tenderness beyond his gruff exterior. After the dissolution of the Demon Slayer Corps, the Kasugai crows transition to freedom. Matsuemon occasionally visits the Ubuyashiki estate and maintains contact with Tanjiro, reflecting enduring loyalty. His journey from a proud, self-focused messenger to a devoted partner to Ginko illustrates character growth across his service and beyond.