Arisu Yotsuba is the heir to the vast Yotsuba Zaibatsu conglomerate and a student at Nanatsubashi Academy. Her close friendship with Mana Aida and Rikka Hishikawa began in elementary school when Mana wandered into the Yotsuba mansion’s yard chasing a butterfly. After Arisu was bullied by older boys, Mana intervened, and when the bullies returned with an older sibling, Arisu used her martial arts training from her grandfather to defeat them, an outburst she later regretted. This experience shaped her generally gentle, quiet, calm, and bubbly nature, though she possesses a fierce temper when friends are mocked or hurt, often followed by remorse. Her affluent upbringing cultivated talents in music, sports, martial arts, and cooking, and she places great trust in her family’s chief butler, Sebastian. She maintains her bond with Mana and Rikka through monthly tea parties. Arisu discovered the Pretty Cure team through security footage at properties like Clover Tower and deliberately erased it to protect their secret. She became Cure Rosetta after finding Lance, the bear-like fairy partner, at her school and overcoming her hesitation to intervene in a battle. Her transformation involves placing a Cure Lovead onto Lance’s heart medallion, stating “Pretty Cure Love Link!”, and spelling “L-O-V-E” on her Lovely Commune device. As Cure Rosetta, her hair lightens to orange and is styled in curled twin-tails with clover-shaped accessories, while her yellow dress features light green detailing, puffed sleeves, and a gold heart on the chest. She declares, “The warmth of the sun! Cure Rosetta!” Her defensive techniques include “Rosetta Wall” (chanted as “Stiff and Strong, Rosetta Wall”), “Rosetta Reflection” for purification, and “Rosetta Balloon” using light ribbons or a giant Lance figure. Collaborative attacks include Lovely Force Arrow and Royal Lovely Straight Flush using weapons like the Love Heart Arrow and Magical Lovely Pad. In the movie where the villain Marsh alters the past, Arisu fights alongside Rikka within distorted memories, and in a future wedding scene she appears in a yellow dress with transparent silk and low curled bun-like pigtails, also gaining a wedding-themed Super Mode called Engage Mode. She later appears as Cure Rosetta delivering a tenth-anniversary message in HappinessCharge Pretty Cure! Her birthdate is May 28, making her zodiac sign Gemini. An unused concept originally included an older brother, Hiromichi. She has a simmering rivalry with Reina Itsutsuboshi, who perceives her as a competitor. The clover motif in her name—“Yotsuba” meaning four-leaf clover—underscores her role as a guardian of luck and protection.