TV-Series
Description
Léopold Vermillion is the second son of House Vermillion, one of the royal families of the Clover Kingdom, and a member of the Crimson Lion Kings, a squad of the Magic Knights. He is the younger brother of Fuegoleon Vermillion, the squad captain, and Mereoleona Vermillion, the former captain. His appearance includes long, messy vermilion hair, a portion of which is kept in a braid, red markings around his turquoise eyes, and a somewhat small stature that grows taller as the story progresses.

Léopold possesses a loud, hot-blooded, and straightforward personality, often acting without thinking. Despite being a royal, he holds no classist prejudice and does not look down on commoners. He is deeply respectful of his older siblings and feels an intense pressure to live up to their towering reputations. His desire to overcome the shadow cast by Fuegoleon and Mereoleona drives him to train relentlessly.

He declares the protagonist Asta to be his rival, not because Asta is a commoner, but because he recognizes Asta's unwavering determination and anti-magic abilities as a worthy benchmark for his own growth. This rivalry is one of mutual respect, and Léopold sees Asta as an equal rather than an inferior. He also holds a rivalry with Yuno, though with less initial warmth, due to Yuno being Asta's other rival.

Léopold's role in the story evolves from a brash, immature newcomer to a capable mage who earns the trust of his squad. During the attack on the capital by the Eye of the Midnight Sun, he is paralyzed by the experience and unable to prevent his brother from falling into a coma. This failure becomes a turning point, fueling his determination to grow stronger. In the Elf Reincarnation arc, he leads his fellow Crimson Lions against formidable threats, and by the Heart Kingdom training arc, he learns array-based magic, unlocking a new level of power. He later participates in the Spade Kingdom invasion and the final battle against Lucius Zogratis, surviving to the end.

His key relationships are defined by the formidable expectations of his siblings. He adores Fuegoleon and aims to emulate his disciplined leadership, while he both fears and admires Mereoleona for her raw, untamed combat strength. He is also cousins with Mimosa Vermillion and Kirsch Vermillion. His relationship with Asta is central to his character development, as it forces him to reject the stagnation of privilege and embrace the grind of hard work.

Léopold wields Fire Magic, initially relying on basic spells such as Spiral Flame and Deep Crimson Spiral Flame. His training in the Heart Kingdom allows him to use magical language formulas, granting him more precise and destructive techniques. His most notable advanced spell is Ultimate Fire Magic: Crimson Eruption, a large-scale array-based spell that creates a massive fiery explosion. During the final battles, he develops True Fire Magic, a unique evolution of his abilities that establishes his own identity separate from his siblings. His combat style emphasizes persistence and lifesteal, allowing him to endure prolonged conflicts.

Over the course of the series, Léopold transforms from a boy burdened by inferiority and self-doubt into a confident mage who has forged his own path. He learns to view the immense strength of his siblings not as an impossible ceiling but as a horizon to chase through continuous labor. His development is one of the healthiest depictions of family rivalry in the story, and he becomes a bridge between the privileged royal class and the grit of those born without status.