Elena Amamiya, a third-year at Mihoshi Middle School, shines as "The Sun of Mihoshi Town," known for her radiant smile and athleticism. She has tan brown skin, purple eyes, golden hair typically styled with an orange headband and small braids behind her ears, plus a distinctive beauty mark below her left eye. Her casual outfits include an off-white top with orange designs, denim shorts, and white-and-orange shoes, while her winter wear features a white sweater with purple accents and a brown jacket. In the movie, she wears a white-yellow shirt with a multicolored shawl and brown boots.

Her family operates the flower shop "Sonrisa" (Spanish for "smile"), reflecting her Mexican heritage through her father. Elena assists there and cares for her five younger siblings while her parents work, showcasing her responsible and nurturing nature. Initially prioritizing family over personal dreams, she later resolved to balance both and pursue her goal of becoming a translator, inspired by her mother, Kaede. Elena experienced childhood isolation due to her skin color but embraced her identity, becoming an advocate for inclusivity.

As Cure Soleil, the "Pretty Cure of the Sun," she transforms using the Star Color Pendant and Star Color Pen, declaring: "Light up the sky! A sparkle full of emotion! Cure Soleil!" Her hair lengthens to her thighs, turning bright blonde in a ponytail with star-adorned headbands. Her orange and yellow costume features layered ruffles, a purple choker, and star-motif knee-high boots. Advanced forms include "Twinkle Style" with purple elements and longer hair; "Libra Cure Soleil" with twin-tails and a bright-yellow dress; and "Scorpio Cure Soleil" with a scorpion-tail ponytail and darker palette. Her signature attack, "Soleil Shoot," is a powerful kick enhanced by cosmic energy; upgraded versions "Libra Soleil Shoot" and "Scorpio Soleil Shoot" utilize Zodiac-based Star Princess Pens.

Elena blends warmth, popularity, and emotional resilience. She uses catchphrases like "Chao!" and "Sounds nice!" and excels at mediating conflicts, a skill honed managing her siblings. Though initially vulnerable about her self-image, she grew into a confident champion of diversity and empathy. Her close friendship with classmate Madoka Kaguya (Cure Selene) includes admiration for Madoka's talents. She also formed a rivalry-turned-alliance with the alien Tenjo, helping heal his past trauma. Elena’s Mexican-Japanese background is integral, developed with cultural consultants for respectful representation. Her creators intended her to normalize diverse beauty standards in Japanese media, particularly for children with similar backgrounds.

Her development centers on self-acceptance and purpose. When first meeting protagonists Hikaru and Lala, she advised them on conflict resolution, later joining them as a Pretty Cure to protect the fairy Fuwa. During her debut battle, she defied antagonist Tenjo by declaring that protecting others strengthens her resolve—a conviction defining her heroism as she consistently prioritizes others' safety and happiness. In her future, she becomes a translator and covers Hikaru’s space mission as a media correspondent.

Elena holds significance as the first dark-skinned main Cure in the franchise, with creators explicitly aiming to promote diversity. Director Hiroaki Miyamoto cited Mexico’s sun symbolism and racial diversity as inspirations, intending Japanese children in a globalizing society to see themselves reflected in her character. Her design and background avoid exoticization, presenting her as a Japanese resident with multicultural roots.