Tōma Inumaru, a 20-year-old idol with auburn hair and piercing red eyes, stands at 176 cm. Born on November 29 (blood type A), he once fronted the band NO_MAD as vocalist until a crushing defeat by TRIGGER shattered his resolve, prompting him to swear off serious singing. This loss ignited a vengeful drive that Ryo Tsukumo manipulated to draw him into the idol group ZOOL under Tsukumo Productions. Though openly antagonistic toward rivals IDOLiSH7 and TRIGGER, Tōma harbors an unexpected softness, exemplified when he discreetly aided struggling Riku Nanase.

His surname, Inumaru (狗丸), includes the kanji for "dog"—a frequent target of ridicule. Ryo enforced this motif through Tōma’s collar-adorned stage outfits, a detail he initially despised but slowly embraced as integral to his persona. As ZOOL’s dual center, he tirelessly bridges the group’s fractured dynamics, advocating collaboration by urging Minami Natsume to craft solo songs tailored to each member’s identity. His insistence on unity underscores his belief in teamwork, even amid internal discord.

Brash yet emotionally guarded, Tōma openly clashes with Ryo’s scheming while wrestling with his own murky motives. He masks vulnerability with sarcasm, deflecting personal inquiries with jokes, yet gradually softens—tentatively addressing teammates’ worries about his past and birthday. This growth surfaces in quiet moments of introspection, where he acknowledges ZOOL’s deepening bonds despite maintaining a defiant exterior.

ZOOL’s music channels Tōma’s edgy, introspective themes, mirroring their "madness and destruction" image. His emblem, the segno—a musical symbol denoting repetition—echoes his journey of confronting past failures to forge new purpose. While early actions framed idolhood as a tool for revenge, his focus subtly shifts toward elevating ZOOL’s collective artistry, suggesting a dawning pursuit of authentic expression beyond personal vendettas.