Leonard Lakes Adler is the eighth prince of the Adrasia Empire and the younger twin brother of the seventh prince, Arnold Lakes Adler. He shares black hair and black eyes with his brother and is widely regarded as a fearless and graceful figure, which has earned him numerous marriage proposals. Leonard is a leading candidate for the imperial throne and has gained renown as the Hero Prince due to his military and heroic achievements. He is highly skilled in swordsmanship, magic, and politics, making him a well-rounded and formidable contender in the succession war.

Despite being labeled as the genius twin, Leonard does not look down on his brother. In fact, he holds deep respect for Arnold’s true abilities, believing that Arnold is far more capable than most people realize. This trust is a key element of their relationship, though Leonard is unaware of Arnold’s secret identity as the SS-rank adventurer Silver. Leonard’s motivations stem from a desire to prove himself worthy of the throne, and he actively participates in the power struggle that follows the death of the crown prince.

His role in the story is that of a respected prince whose competence contrasts with Arnold’s public image of ineptitude. He is the figure that Arnold secretly works to support from the shadows, hoping to see his younger brother become emperor. Leonard’s development involves his growing reliance on Arnold’s behind-the-scenes guidance, as well as his own maturing as a leader. His notable abilities include exceptional swordsmanship, proficiency in magic, and sharp political acumen, all of which position him as one of the most promising heirs to the empire.