Wein Salema Arbalest serves as crown prince and acting regent of the Kingdom of Natra, ruling due to his father King Owen's illness. Long, messy brown hair frames his golden eyes, and his athletic build contrasts his unassuming look. Publicly hailed as a genius leader, Wein privately embodies laziness and a yearning to shirk his duties. His initial primary goal is selling economically weak and strategically vulnerable Natra to a larger power like the Earthworld Empire to secure a comfortable retirement. Yet, his actions consistently trigger unintended positive outcomes that bolster Natra's standing, gradually shifting his motivation toward ensuring the kingdom's stability and peace for his own benefit.

Trained at the Earthworld Empire's Royal Academy under a false identity, Wein excelled academically and militarily, topping all subjects. His true identity was discovered, leading to his records being erased. This experience cemented his pragmatic view of nobility, rejecting bloodline-based status for meritocracy. He argues all noble lineages stem from commoners who achieved distinction, emphasizing ability over heritage. However, he displays intense protectiveness toward the Flahm ethnic minority, especially his aide Ninym Ralei, reacting with extreme violence to discrimination or insults. He executed individuals demeaning Ninym and orchestrated the death of King Ordalasse for threatening her safety.

Wein's relationships define him. Ninym Ralei, his Flahm childhood friend and aide, acts as his moral compass, frequently compelling him to fulfill responsibilities. Their bond transcends duty; Wein calls her "his heart," showing unwavering loyalty where insults against her provoke uncontrollable rage. He dotes on his younger sister, Falanya Elk Arbalest, supporting her political education and demonstrating strong protectiveness. His dynamic with King Owen reflects mutual respect, with Owen entrusting him the regency despite knowing his son's reluctance.

Strategically, Wein employs cunning pragmatism in governance and conflict. He leverages manipulation, economic subterfuge like authoring a book to destabilize rival nobles' finances, and unorthodox combat tactics such as poison and bluffs. Accidental successes, like securing resource-rich territories during conflicts or inadvertently expanding Natra's influence, stem from intellect and situational luck. These outcomes fortify his public image as a visionary while frustrating his personal ambition for a quiet life. As Natra strengthens through these consequences, Wein gradually accepts his role, focusing on maintaining stability to preserve peace.

Key traits include a photographic memory, enabling him to recall names and faces of thousands of citizens and soldiers, bolstering leadership rapport. Despite underestimating his own charisma and his troops' capabilities, he inspires fierce loyalty, notably rallying nervous soldiers during wars. Internally, his conflicts manifest through exaggerated chibi-like imagine spots contrasting his composed public demeanor. This duality underscores his struggle between duty and desire.