Pina is a white Dall sheep and a first-year student at Cherryton Academy who joins the drama club shortly after arriving at the school. He is immediately recognized for his large curved horns and his strikingly handsome appearance, which makes him popular among many students and earns him a reputation as a bishounen by herbivore standards. He is especially admired by female students, although he never enters into a monogamous relationship with any of them and seems to prefer keeping his romantic life casual.

Personality-wise, Pina is smart, cocky, and laid-back. He is flirtatious and charming, but he also delights in provoking carnivores with his words and will speak his mind even when it shocks or offends others. This habit frequently puts him at odds with the prideful carnivore members of the drama club, yet he is not malicious at heart. He behaves almost like a predator even though he is prey, using his confidence, beauty, and sharp tongue to control social situations rather than physical strength. He does not always think carefully before speaking, but he is clever, observant, and brave when faced with real danger. His boldness, however, is partly a performance; when a carnivore genuinely threatens him, his underlying fear can show through.

In terms of motivation, Pina is driven by a desire to avoid feeling trapped, deprived, or vulnerable, and to experience freedom, joy, and excitement. He maintains a carefully constructed facade and treats social interaction like a performance, using masks and provocative behavior to navigate the tensions between carnivores and herbivores. His taunts can be understood as both an expression of his own anxieties about predation and a strategy to assert control in situations where a herbivore would otherwise be at a disadvantage.

Within the story, Pina first appears as a new drama club member who interrupts a confrontation between Legoshi and Bill, immediately making an impression with his bold and careless attitude. He later takes over the locker that belonged to Tem, the student whose death drives much of the plot, and draws attention to the scratch marks on Legoshi's forearm. As the story progresses, he becomes actively involved in the effort to uncover the truth about Tem's death, using verbal provocation and psychological pressure to unsettle the bear Riz, the culprit. He even steps in when Riz shows signs of attacking Legoshi, though he recoils when Riz pretends to eat him, revealing the limits of his courage.

His relationship with Riz is central to his development. Pina initially holds considerable prejudice against carnivores and treats his interactions with Riz as part of a dangerous game of provocation. After Riz surrenders and is sent to juvenile prison, the two grow surprisingly close, with Pina visiting him regularly. Riz later thanks Pina for simply being with him, noting that this was something he always regretted not having with Tem. This shows how Pina evolves from a character who hides behind charm and cynicism into someone capable of genuine empathy and connection across the carnivore-herbivore divide. He similarly develops a friendly, teasing bond with Legoshi, and his sharper edges soften over time.

Pina's notable abilities are social and psychological rather than physical. As a Dall sheep, he has no natural combat advantages, but he is a talented actor who can adopt different personas with ease. His beauty gives him social influence, his quick wit allows him to outmaneuver opponents verbally, and his willingness to place himself in risky situations makes him an effective provocateur and investigator. His horns, which he is especially fond of, are also a defining part of his identity and appearance.