Peridot is a female Papillon Jewelpet with yellow fur, white chest and ear tufts, plus green ears and tail. Her jewel eyes are peridot gemstones. She typically wears a green and yellow butterfly-shaped hair clip near her left ear and a green and yellow flower garland around her neck. She occasionally carries a lavender microphone or wears aviator goggles while piloting a yellow biplane.

Representing positiveness and dream fulfillment, her magic encourages proactive, future-oriented thinking and manifests dreams into reality. She can fly by flapping her ears in certain series. Her skills include photography using a Jewel Pod device and athletic talents, especially ice skating, where she develops specialized techniques like a fire tornado.

Peridot's personality varies. Initially depicted as fluent in English due to her voice actress, later portrayals reveal this as an affectation. She is typically energetic, kind, and encouraging, often ending sentences with "desu." She maintains a spiritual connection to butterflies and exhibits a "big sister" attitude. Storylines explore her American-coded mannerisms being temporarily removed and reinstated.

In early storylines, Peridot appears to Michiru Okegawa when he abandons his dreams, using her microphone to rally encouragement and casting a spell fulfilling his deepest aspirations. She later works with Jewelpets Luna and Milky at the Strawberry Café. Subsequent narratives show her as an unpartnered Jewelpet dispensing advice at a magic academy before acquiring a human partner in an OVA.

As a later season's main character, Peridot becomes roommates with Hinata at Sunshine Academy, encouraging her to overcome shyness. Discovered by legendary ice skater Munata, she trains seriously, uses her skating abilities to combat dark magic forces, and achieves her ambition of becoming a world-class ice skater.

Adventure-focused storylines position her as Ruby's childhood friend, frequently departing on expeditions in her biplane. She serves as Santa's helper in one episode. While job-seeking, she experiments with fortune-telling, babysitting, and managing a mobile café. Babysitting leads to a meaningful connection with a child named Ayame, resulting in them creating a Magic Gem together.

In a mentoring-focused narrative, Peridot temporarily replaces Ruby as Momona's partner after their separation, dissolving when Momona reconciles with Ruby. Working at a sushi restaurant, she struggles with food delivery by feeding stray cats and consuming orders herself. After achieving human form – depicted as a girl with lime green hair, vest, and shorts – she improves the sushi recipes, revitalizes the business, and retains her sushi-eating habit.

Peridot appears briefly in a theatrical film, waving farewell to companions. Her human form consistently features green hair with a butterfly clip, a long ponytail with yellow streaks, a sleeveless top, brown shorts with a green bow, beaded bracelet, and crystal high-heeled shoes.