Serious is an exemplary student with a serene, methodical approach to intellectual challenges, recognized for his stark white hair and poised presence. He acts as a steadfast voice of reason alongside Leon, tempering the latter’s impulsiveness with calculated strategies and academic guidance. Tasked with devising mission tactics and tutoring peers—particularly Leon, whose recklessness he curbs through constant companionship—he ensures their academic and operational success.

A relentless researcher, he immerses himself in studies with single-minded intensity, occasionally freezing mid-analysis as his focus narrows. This habit fuels campus whispers questioning his humanity, a theory he quietly resents. Though his logic-driven mindset echoes archetypal rationality, he balances this with subtle emotional awareness, prioritizing structured solutions over detached pragmatism.

During crises, such as stabilizing a collapsing floating academy or containing demonic breaches, he contributes to collective efforts by coordinating peers and troubleshooting obstacles. His partnerships underscore a steadfast dedication to communal goals, collaborating earnestly with academically struggling allies to overcome adversity through meticulous preparation and adaptability.