Kaolinite

For most of her run Kaolinite is pale-skinned with grey eyes and a long fall of red hair, usually dressed in a short red v-necked frock and sometimes throwing a lab coat over it. Close shots give her irises an entirely purple cast streaked with yellow where the pupils sit. When she rejoins the Death Busters later on, her look darkens completely into a floor-length black gown with a flared collar, a black pendant, grey tights, and black shoes.

Kaolinite carries herself as the confident lead agent of the Death Busters, eager to prove her worth by claiming Pure Hearts for Professor Tomoe. After she is brought back from death, a more human streak surfaces, since she openly harbors romantic feelings for the professor and is reluctant to take up the villain's cause again, doing so only to please him. That same affection makes her final betrayal all the more bitter, because she is genuinely happy for Tomoe at the very moment she is cast aside.

As the earliest of the Death Busters to chase Pure Hearts, Kaolinite sends Professor Tomoe's Daimon Eggs against people she suspects of carrying a Pure Heart Crystal, only to watch the Sailor Guardians repeatedly wreck her schemes. Her strongest servant, the Daimon Cenicienta, manages to draw out Usagi's Pure Heart, which at first appears to be a talisman before Tuxedo Mask hands it back. Once Cenicienta seals Tuxedo Mask inside glass, Kaolinite, having worked out that Usagi is Sailor Moon, summons her to Tokyo Tower. There Cenicienta again pulls the heart free, yet Sailor Uranus judges it no talisman and returns it. Sailor Venus then masquerades as Sailor Moon to persuade Kaolinite she has fixated on the wrong girl.

In the clash that follows she takes on Sailor Uranus and Sailor Neptune while the rest of the team battles Cenicienta. Kaolinite herself is a formidable sorceress, stretching and controlling her red hair to bind, throttle, or tie up foes, hurling powerful energy blasts, teleporting, floating in midair, and once conjuring an enormous crystal to menace Sailor Neptune. After Sailor Moon destroys Cenicienta, Kaolinite deploys a culture-growth hormone of her own making to soak up the Daimon's power, gaining a glass blade and firing a spray of crystalline shards that entombs whatever they hit in glass. So durable that she shrugs off Sailor Planet Attack with only light harm, she is on the verge of finishing the Guardians when Sailor Uranus turns on the plan, lands World Shaking, redirects her own crystal beam back at her, and seals her in crystal. The blow buckles part of the tower and sends Kaolinite plunging to her death, clearing the way for Sailor Moon to escape.

Professor Tomoe later resurrects her, and she becomes Hotaru's guardian. Coaxed back into the ranks, she resolves to seize the purest heart within reach and settles on Chibiusa, bringing the girl to their laboratory where Hotaru extracts the Pure Heart and awakens as Mistress 9. Even as Kaolinite rejoices at the professor's triumph, Mistress 9 strikes her with lightning and hurls her into a lethal electric barrier. Her body fades away, and Mistress 9 coldly remarks that she has outlived her usefulness.