Pochi, a Bull Terrier owned by Tokyo’s renowned star Sagiyama Aya, crosses paths with Tetsunoshin after escaping harassment from John, a confrontational dachshund. Their bond evolves into an unbreakable brotherhood, with Pochi steadfastly championing Tetsunoshin’s ambitions despite external skepticism, often addressing him as “big brother” with reverent loyalty. This devotion peaks during a pivotal episode where Pochi’s self-worth hinges entirely on his role in Tetsunoshin’s life, exposing his deep emotional need for their connection.

Though inherently timid—avoiding conflicts and recoiling from spicy flavors—Pochi defies his cautious nature to aid Tetsunoshin, joining perilous missions or confronting foes despite his anxieties. Magic temporarily transforms him into “Celebrity Knight Julius,” a masked human alter ego mirroring Tetsunoshin’s guise, though this fleeting metamorphosis remains a singular event.

Pochi’s loyalty faces trials during clashes with the Shirogane Dogs, notably when false accusations force Tetsunoshin to shield him, reinforcing their mutual trust amid vulnerability. Later, a heated clash briefly fractures their relationship, though their foundational loyalty ultimately mends the rift.

The provided sources do not reference appearances in films, OVAs, or spin-offs.