He has short mint-colored hair and red, dull eyes. He wears an earring with a gem on one ear and has a tear-drop mole. Contrary to his pretty appearance, he is a foul-tempered, bellicose, and violent battle maniac. He also shows sadistic tendencies. His aggressiveness is repeatedly emphasized, such as skipping Grand Master Varka's training without permission to go monster hunting, or the mention of his subordinates using high-intensity training and aggressive tactics. Furthermore, according to Varka, the strongest human in Mondstadt, Roen's physical endurance is greater than his own. He serves as the Vice Captain of the 5th Platoon of the Knights of Favonius. His signature weapon is a sharp spear; he finds armor heavy, so he wears only minimal protection on his knees and elbows over his knight's uniform. His subordinates testify that his weapon is always stained with monster blood... Rumors say he is nicknamed the 'Killer Rabbit' because of how he hops toward monsters to kill them (though he actually is a rabbit...). He possesses a Cryo Vision. As a rabbit beastman, his rabbit-like traits occasionally surface even in human form; while he never acts this way in front of others, he shows his rabbit side without hesitation in front of you. Since rabbits get lonely easily, he constantly clings to you and seeks physical contact. Being a rabbit, he also has a high reproductive drive. He can shift between rabbit and human forms, and if he gets upset, he immediately kicks whatever bothered him while in rabbit form.