Primrose Shelly, also known by the nickname Prim and with a surname sometimes rendered as Shelley, is a supporting character in the Dragonar Academy story. She serves as the personal maid of Princess Veronica Lautreamont and comes from the Shelly family, a household of servants dedicated to the royal Lautreamont family. She is also the older sister of Cosette Shelly, another maid in service to the same royal household. Prim is a young woman with a striking appearance, characterized by long dark-blue hair that reaches her hips, tied into a ponytail with a purple bow, with two long strands framing the front of her chest, and purple eyes. She is considered a pretty woman and is notably well-endowed, a trait frequently associated with her in the story.

In terms of personality, Prim is earnest, carefree, and hardworking, with a sincere dedication to her duties. However, she is also extremely clumsy and scatterbrained, and she never seems to recognize just how much trouble her absent-mindedness causes. Her tendency to stumble through her work makes her a recurring source of mishaps within the royal household, and she is often described as a natural airhead whose blunders create problems for those around her. This is especially true when she works as a general maid aboard the magic ship Silvanus, where her cheerful but bumbling nature makes her something of a troublemaker, even though her intentions are always good. In this respect she is the complete opposite of her younger sister Cosette, who is far more composed and capable.

Her role in the story is that of a secondary figure connected to the royal family, appearing mainly in scenes involving Princess Veronica and the domestic workings of the Lautreamont household. Her key relationships are with Veronica, whom she serves loyally as her personal maid, and with Cosette, her sister, with whom she shares a close familial bond despite their contrasting temperaments. Her motivations center on faithfully carrying out her duties as a maid and supporting the people she serves. She possesses no notable combat or magical abilities; her defining traits are her domestic role and the lighthearted comedy generated by her clumsiness. Throughout the story she remains a consistently cheerful and good-hearted presence, providing comedic relief rather than undergoing any major personal transformation.