Ayanami is a Fubuki-class destroyer and a KAN-SEN serving under the Sakura Empire, who appears as one of the main protagonists in the Azur Lane: Slow Ahead! anime series. Her name is a reference to the historical Japanese destroyer Ayanami, and her character design features light gray or white hair tied in a high ponytail, often accompanied by mechanical headpieces resembling animal ears, and red eyes. She typically wears a modified schoolgirl uniform that exposes her midriff, though her appearance changes after her retrofit.

In terms of personality, Ayanami is known for being reserved, introspective, and socially awkward, with a quiet nature that makes her unaccustomed to expressing her emotions openly. Despite this stoic exterior, she is deeply loyal to her companions and possesses a hidden warmth and tenderness. Her understanding of the world is largely limited to combat and her duties as a ship-girl, which can sometimes give her a detached or otherworldly vibe when dealing with ordinary social interactions or concepts unrelated to battle. However, when engaged in combat, her demeanor shifts dramatically, and she transforms into an unstoppable and ferocious fighter. This contrast is reflected in her fearsome epithet, the Demon of Solomon, a title earned by her historical namesake.

Ayanami's primary motivation revolves around her role as a cornerstone combatant of the Sakura Empire and her desire to protect those she holds dear. Through her unexpected encounters with allies from other factions, such as Javelin and Laffey, she gradually learns to lower the walls between herself and others, discovering the resolve to fight not just out of duty, but out of personal bonds. In the Slow Ahead! series, her role in the story focuses on these lighter, slice-of-life interactions as she navigates daily life alongside her fellow ship-girls, showcasing her growth in understanding friendship and camaraderie. Key relationships include her fellow starter ships, and her development often centers on becoming a more devoted protector and a more socially engaged individual as her affection for those around her increases.

Notable abilities include exceptionally high torpedo stats, which are considered among the highest of all destroyers, especially after her retrofit. Her rigging consists of a single twin gun mount and two triple torpedo tubes, and her combat skills include a powerful skill named after her epithet, the Demon. Upon retrofitting, her equipment is reconfigured to enhance her evasion capabilities and grants her a powerful linear barrage attack, making her a formidable force capable of tearing through entire enemy fleets.