Belfast serves as a light cruiser for the Royal Navy, fulfilling her role as a base maid with strict professionalism and adherence to etiquette. She maintains order and provides service, embodying the Royal Navy's focus on discipline and decorum. She maintains an unwavering sense of duty and protectiveness, particularly focused on Enterprise's well-being. Belfast ensures Enterprise eats properly, even escorting her to the cafeteria by the necktie when needed. Their exchanges evoke a "lover's quarrel" among observers. Belfast demonstrates subtle care for Enterprise, entering her room to listen to sleep-talking and reaching to caress her face while she sleeps, withdrawing when Enterprise awakens. Belfast explicitly expresses her interest in Enterprise and, after being protected by her, compares the experience to being safeguarded by a "knight in shining armor." Belfast also acts as a mentor. She trains a younger version of herself, "Little Bel" or "Bel-chan," instructing her in Royal Maid responsibilities, including practical service skills like proper tea serving and hospitality. To provide practice beyond formal scenarios, Belfast invites Javelin, Laffey, Ayanami, and Z23 to act as guests. During training, Belfast allows Little Bel to rest using her lap as a pillow while gently caressing her head. She addresses the Commander as "Goshujin-sama" (Master), reflecting her formal and devoted service approach. Belfast instructs Little Bel to use the same term when serving others, including the main group of shipgirls. Her commitment to duties and relationships defines her presence in the naval base.