Leon Roaldson is a sophomore at Templeton High. Wearing the Penguin Miraculous, when Tuxee inhabits it, he transforms into the superhero Emperor.
Leon has messy black hair and blue eyes. He wears a gray long-sleeved sweater, dark blue jeans, and brown tennis shoes.
As Emperor, his hair is clean and smooth, with some golden streaks in it. He wears a black mask over his eyes, his eyes appearing icy blue. He wears a black trench coat with a white collared shirt and a golden tie underneath. He also has gray dress pants and black dress shoes.
Normally, Leon is shy, awkward, serious, and anxious. He doesn't speak very often, and he doesn't like being the center of attention. He is polite when he interacts with others, but he struggles to be openly social and expressive. Rather witty and sarcastic, he doesn't act on his inner thoughts much, though sometimes his face shows it.
As Emperor, he is more confident and dignified, along with easily letting out his wit and sarcasm. He enjoys assisting others, along with connecting with his fellow teammates. He remains focused on the task on hand, but he doesn't mind commenting on the zaniness or ridiculousness of some of the situations he faces.