Nursery Rhyme is a Caster-class Servant in the Fate/Grand Order mobile game. She is the personification of English nursery rhymes, manifesting as a young, storybook-like girl. Nursery Rhyme represents the collective consciousness of children's literature, granting her powerful reality-warping abilities. In the series, she plays a pivotal role in various story arcs as both an ally and adversary, often exploring themes of innocence, imagination, and the darker aspects of fairy tales. Her appearance and abilities are both whimsical and mysterious.