Nelly is a porcupine with flesh-toned skin, brown quills styled like hair, and bright blue eyes. Her attire includes a purple witch hat, green scarf, pink top featuring a crescent moon and star, pink checkerboard skirt, and pink shoes. Initially whiny and dependent, relying on others for basic tasks, she transforms into a bubbly, energetic child fueled by aspirations of wizardry. Her core drive is spreading joy and improving the world through kindness and compassion. Witnessing conflict deeply distresses her, often leaving her feeling helpless when unable to intervene, yet she persists relentlessly toward her goals despite obstacles.

Her magical abilities encompass spellcasting and broom-based flight. Creatively, she crafts castanets that instill joy and peace in others, directly supporting her mission to foster happiness. Nelly is Milly’s younger sister. She joins Zorori’s travels during the magic forest restoration arc in the first season of "Majime ni Fumajime Kaiketsu Zorori," collaborating with Zorori, Ishishi, Noshishi, and the enigmatic Najō to revive the enchanted woodland.

Key episodes chart her growth and trials: "Nelly’s Mistake" sees an error triggering complications, while "Rescue Nelly" places her in peril, underscoring her vulnerability and the loyalty of her companions. She reappears in Episode 7 of the 2020 series "Motto! Majime ni Fumajime Kaiketsu Zorori." Throughout her journey, her unwavering commitment to becoming a wizard and cultivating peace highlights her evolution from dependency to a proactive catalyst for positive change.