Kanade Chidori serves as one of Hinomori's guardians, the Purple Princess, whose rhombus motif defines her transformed identity. Her features include brown skin, curved purple eyes, and short dark-purple-to-brown hair with split bangs framing her face, plus a loose forehead strand and a distinctive purple peony mark.

In civilian life, she dons a modified male uniform: a white polo shirt with folded collar, light brown tie, beige pants with brown suspenders, and white school shoes. As Purple Princess, her hair lengthens slightly, adorned by a gold headband with diamond amethyst gem, butterfly hair ornament, and heart earrings. Her battle attire features a dark-purple sleeveless top with light-purple ribbon and blue gem, flower-shaped tutu, lilac petal ribbon, black stockings with gold lining, and lilac-accented boots with white fabric. Light-purple choker and white wrist accessories complete the ensemble.

She embodies "Chi" (wisdom) as counterpart to the Moon Cat. By day, she leads Hinomori's infrastructure company, leveraging underground blueprints to fortify the city's windmill defenses. In combat, she strategizes for fellow Heart Princesses, wielding her wand as a katana or railgun—mounted on one arm to fire concentrated purple beams. She joins the combined "Conviction Finale Formation," slamming enlarged wands onto targets.

She collaborates with fellow high-school-aged princesses Makoto Yoshitada and Megumi Daishin, though Makoto's energy challenges her. Interactions with Haruka Hani, Ami Gidou, and Yukari Mure remain neutral or cordial. Her tactical intellect anchors the team. Unique traits include her dark skin, avoidance of softer purple hues, and exclusive use of a male civilian uniform.