Nozomi Yumehara attends L'École des Cinq Lumières as a second-year student, known for her energetic, optimistic, and scatterbrained nature. Initially uncertain about her future, she frequently changed hobbies and faced academic challenges. Her life transformed when she found the Dream Collet in the school library and met Coco, the prince of the destroyed Palmier Kingdom, whose enemy was the Nightmare organization. Inspired by his desire to rebuild his home, Nozomi committed to gathering the 55 Pinkies required for the Dream Collet. This awakened her potential as a Pretty Cure, granting her the Pinky Catch transformation device. Guided by a pink butterfly, she became Cure Dream, the Pretty Cure of Hope, declaring her resolve with the phrase "It's decided!".

As Cure Dream, she displays increased seriousness and enhanced physical strength. Her primary attack, Dream Attack, manifests as a pink butterfly-shaped energy blast. She later acquired the Dream Torch, enabling the crystalline projectile attack Crystal Shoot. In team battles, she contributes to combined assaults like Five Explosion and Rainbow Explosion. Power advancements include Super Cure Dream, achieved using Miracle Lights in *Kagami no Kuni no Miracle Daibouken!*, featuring butterfly wings and upgraded attire. Within *Yes! Pretty Cure 5 GoGo!*, her Shining Dream form bestowed angelic wings and a feather-themed costume, while the Rainbow form maintained the wings with gold accents. Her Dream Cure Grace form incorporated butterfly-winged attire and floral designs.

Relationships significantly shape her journey. She shares a deep, lifelong friendship with Rin Natsuki (Cure Rouge), whose steadiness counterbalances her impulsiveness. Urara Kasugano (Cure Lemonade) admires Nozomi's openness, which aided Urara in overcoming loneliness. Nozomi's romantic connection with Coco began with an instant crush on his human guise, Kokoda Kouji, their homeroom teacher. Their bond strengthened over time, with Coco serving as her mentor and protector. In *Kibou no Chikara ~Otona Pretty Cure '23~*, they married after Coco proposed during her recovery from injuries sustained protecting others as Cure Dream. Her initially contentious dynamic with Milk (later Milky Rose) matured into mutual respect despite early clashes over Coco's attention. As an adult teacher at Plaisir Academy, Nozomi mentored Rumi Katagiri, supporting Rumi's dance aspirations and fulfilling her own childhood dream.

Nozomi's evolution spans series narratives. In *Yes! Pretty Cure 5*, she matured from an unfocused student into a resolute leader, discovering her ambition to teach through Coco's influence. *GoGo!* tested her determination against the Eternal organization, solidifying her dedication to hope and friendship. *Otona Pretty Cure '23* portrayed her as a committed educator who occasionally transformed despite physical risks, demonstrating her maturity while preserving her innate optimism. Her path consistently highlighted perseverance and empathy, exemplified by her compassionate defeat of adversaries like Desparaia.

Visually, Nozomi possesses dark magenta hair and purple eyes, typically styled in pigtails secured by yellow bobbles. Her casual wear includes seasonal variations, such as a pink blouse with dark blue pants or summer vests and skirts. Transformed as Cure Dream, her hair extends into loops held by butterfly clips, complemented by a pink crop top and skirt ensemble featuring chiffon details and a chest brooch. The *GoGo!* redesign introduced rose accents and collars for a refined aesthetic. Her Shining Dream form presented feather-like layers and white wings, while Dream Cure Grace incorporated flowing fabrics and butterfly-winged skirts.

Her name embodies her core: "Yume" (dream) and "Nozomi" (hope) signify her identity as the Pretty Cure of Hope.