Error Musume (エラー娘) is a recurring comedic mascot character in Kantai Collection. She is the small, childlike ship-girl who appears when a player’s sortie or action fails, serving as a visual indicator of an error state or unsuccessful operation. Rather than being a combat unit or major story character, she functions as a symbolic guide and warning sign in the series’ game-based setting. Her presence adds humor and personality to otherwise frustrating failure moments.