Lily Parker, originally named Kise Yayoi in the Japanese version, stands as a central character. Her civilian persona is a shy, artistic teenager with hazel eyes and shoulder-length blonde hair, usually secured by a white headband adorned with orange gems. She favors outfits in yellow and orange tones, like a gold dress layered over a pale yellow blouse, paired with dark orange Mary-Jane shoes and frilly white socks, shifting to denim shorts and sandals in warmer seasons. As a student at Rainbow Hills High School, her uniform is a navy blue dress with a yellow tie. Shorter than her peers, Lily initially faced social challenges due to her timid, crybaby nature, often withdrawing despite a deeply empathetic core. Art, especially creating comics about her superheroine Golden Light, provided a consistent outlet. Early experiences, including playing games like bouncy ball roll and the childhood loss of one parent, contributed to her reserved outlook.
Transforming into her superhero identity, Glitter Peace (or Glitter Yellow/Geel regionally), she wields lightning-based powers. Her appearance dramatically shifts: her hair brightens, lengthens, and forms an updo accented by a white tiara with yellow gemstones and wing-like earrings, plus a gold choker. Her costume features a short yellow dress with gold and white details, puffed sleeves beneath feathered layers, gold spheres on the shoulders, a light yellow bow with a brooch on the chest, and pointed coat-tails at the back. She wears yellow shorts beneath the skirt, white boots tied with gold ribbons, and matching wrist accessories. This form grants abilities like Sparkle Lightning, summoning lightning from her fingers to electrocute or paralyze foes, though recoil sometimes affects her. An enhanced version, Sparkle Lightning Hurricane, generates a massive lightning column. She also combines attacks, notably Sparkle Lightning Blizzard with Glitter Breeze, merging ice and lightning.
Lily's character evolves significantly after joining the Glitter Force. Encouraged by friends Emily and Kelsey recognizing her artistic talent, she reveals a more passionate, resilient side. Confrontations, especially those threatening friends, trigger a decisive shift from timidity to courage and conviction. While retaining her inherently sweet, bubbly, and optimistic disposition—often finding the positive—she becomes proactively dedicated to her protector role. Her transformation catchphrase, "Puppies and kittens! The power of love! I'm Glitter Peace!", reflects this earnest approach. Team relationships deepen: she bonds with Emily over shared empathy as newcomers, endures Kelsey's affectionate teasing about her crybaby tendencies, and admires Chloe's artistic appreciation. Though initially hesitant in combat, preferring non-confrontation villains could exploit, she grows into a determined warrior.
Her transformation uses the Glitter Pact. Inserting a Glitter Charm, she declares "Insert Glitter Charm!" followed by "Glitter Force Makeover!". A powder puff appears; tapping it while calling for "shades of power" triggers sequential appearances: armbands ("Glitter Bands!"), boots ("Glitter Boots!"), and dress ("The power of peace!"), culminating in a hairstyle change and blush application before landing in her superhero pose. Upgraded forms augment her abilities:
- **Tiara Mode**: Activated with a yellow star Tiara Charm, adding a golden tiara for group attacks like Tiara Mode Torrent.
- **Glitter Princess Mode**: Achieved via a Princess Wand and yellow shooting star Glitter Charm, featuring a wavier hairstyle, light yellow overlay dress, and golden halo, enabling Rainbow Burst attacks.
- **Ultra Power/Ultra Mode**: Accessed with an ultra Glitter Charm, surrounding her with a yellow aura to enhance physical and magical strength for techniques like Sparkle Lightning Hurricane.
- **Royal Mode**: Utilizing the Ultra Glitter Charm, this form adds a feathered overcoat-like extension, wings, and teleportation or flight capabilities, used for ultimate group attacks like Royal Rainbow Burst or Miracle Rainbow Burst.
Notable trivia includes her name "Lily" reflecting purity or innocence, aligning with her core personality, while "Kise Yayoi" references "yellow river rapids" and the lunar month of March. She shares naming parallels with Glitter Sunny/Cure Sunny in retaining the latter part of her original alter ego. Other traits encompass being an only child, artistic talents developing young, and a noted resemblance to Pikachu due to shared yellow color schemes and electricity-based powers.