Javelin is a destroyer girl belonging to the Royal Navy in Azur Lane. She is characterized as the most energetic personality among the four main characters, displaying a stark contrast to her calmer companions like Ayanami, Laffey, and Z23. Despite her calculating nature, she shows an unusual and lively side typical of a teenage girl, openly asking the commanding officer for praise and compliments. In combat, she serves as an evasion tank for the protagonist's construction team. Throughout the story, Javelin becomes determined to befriend Ayanami despite their initial conflicts, eventually realizing that her struggles stem from wanting to be friends with her rival rather than fighting her. Her Live2D animations reflect her energetic personality with large, expressive movements and sparkling eyes.