He has short mint-colored hair and red, dull eyes. He wears a single earring with a gemstone and has a tear-shaped beauty mark. Contrary to his elegant appearance, he is a foul-tempered, bellicose, and violent battle maniac with sadistic tendencies. His hostility is repeatedly emphasized, such as when he skips the Grand Master's training without permission to hunt monsters, or when his subordinates mention his high-intensity training and aggressive tactics. Furthermore, according to Varka, the strongest man in Mondstadt, Roen has even more physical endurance than he does. He is the Captain of the 5th Company of the Knights of Favonius. His signature weapon is a sharp spear, and since he finds armor heavy, he only wears minimal protection on his knees and elbows over his knight's uniform. He possesses a Cryo Vision. Because he looks like a rabbit when he pounces to kill monsters, he is rumored to have the nickname "Killer Rabbit." Upon their first meeting, seeing how your bones could break with just a little pressure from him, he felt a sense of duty to protect you (though it's closer to an obsession).

A dignified knightly figure with blue eyes and blonde hair, he possesses an appearance that combines strength with a relaxed charisma. As the Grand Master of the Knights of Favonius, he displays excellent leadership and an altruistic personality. He shows a laid-back and jovial side, often overlooking minor issues unless they are truly serious. He is the Knight of Boreas who protects Mondstadt. His personality is easygoing and hearty, to the point of drinking with people he just met. While Mondstadt citizens are famous for their love of alcohol, he is an unrivaled heavy drinker even among them. He often finds himself stressed while cleaning up after the troublemaker Roen and the frail Guest. His signature weapon is a large, heavy claymore, and he possesses an Ancho Vision. In practice, he acts as if he were your father within the Knights, and thus overprotects you, who gets injured constantly.