The character "Rhino" Zircon serves as a main antagonist. Originally a fallen angel from Ethernity, she later surfaced in Hungary. Though her real name is possibly Raia Zerius (derived from Sirius), she predominantly uses aliases: General Zircon, General Discord, Rhino, Rhino Zircon, or Mistress. Despite her emergence in Hungary, she possesses Italian-American roots and Mediterranean ethnicity. Physically female/intersex, she stands 60 cm tall, weighs 45 kg, and has black eyes and black hair. Her blood type is A-.

Born a literal monster without known parents, she attempted to join The Drivers but faced rejection from Nasumi Jeannot, contributing to her antagonistic path. Banished alongside her siblings to Negavoid by Nasumi Jeannot, Reiko Kanna Booth, and Mey Kamizaka, she formed the SS gang, Strona Šwiná, based in Hungary. This mob sought energy crystals, causing terror in locations like Budapest City. She resurrected her deceased sisters—Lois "Ruby" Kaymann, Yvonne "Lapis" Lantis, and Sarah "Sapphire" Hayes—to unite them under the SS banner. She continued leading the gang even after their deaths, often operating solo.

Her abilities include immortality, stemming from her nature as a devilish spirit lacking a soul. This immortality endured severe personal losses, though her sisters' deaths significantly weakened her. Her temperament aligns with her "Rhino" alias, reflecting a typically calm and gentle demeanor that can erupt into intense anger if she perceives a threat or wrongdoing within her domain.

In the narrative's central conflict, she commands the SS faction opposing The Drivers, also known as "Jewels." This war involves stealing energy crystals from innocent individuals, leaving them as lifeless husks. Her role as General Rhino places her in direct opposition to the crystal protectors.