Ryoma Terasaka navigates Kunugigaoka Junior High School's Class 3-E through physical intimidation and bullying, tactics central to his academic and social survival. His bulky frame, spiky brown hair streaked with blond, and piercing light-green eyes mirror his confrontational nature. Academically stagnant, he coerced peers into completing his assignments, a parasitic strategy that landed him in Class 3-E. There, he relished the absence of rigor, thriving in an atmosphere where intimidation and indolence went unchecked.

The arrival of Korosensei ignited Terasaka's resistance; he rebelled against the teacher's push for growth, scheming to assassinate him and restore Class 3-E's complacency. His refusal to adapt left him lagging behind peers who seized self-improvement. Manipulated by Shiro in a pivotal assassination attempt, the ensuing peril to classmates jolted Terasaka into guilt-driven transformation, shifting his focus from self-preservation to safeguarding others.

Post-redemption, Terasaka's resolve solidified—he withstood a poisoning ordeal to assist classmates, emerging as a proactive leader. He guided Itona Horibe away from destructive power pursuits, revealing a strategic mind as his exam scores surged from 230 to 340. Though still hotheaded, empathy surfaced; he bolstered peers and connected with Kurahashi Hinano, valuing her unflinching honesty.

Complex relationships define Terasaka: a rivalry with perceptive Karma Akabane, who respected his brute strength; a bond with Nagisa Shiota forged through clashing ideologies; and unwavering loyalty from his gang—Takuya Muramatsu, Taisei Yoshida, and Kirara Hazama—captivated by his raw authenticity. His passions for pro wrestling and gyudon clashed with literary aversion, yet he uncovered an aptitude for home economics.

Ultimately, Terasaka adopted optimism, cherishing Class 3-E's camaraderie. His political ambitions, initially rooted in seeking comfort, evolved into a testament to self-growth and collective resilience.