Cendrillon

Cendrillon (サンドリヨン) is a character introduced in Shinyaku Toaru Majutsu no Index. She is a magician affliated with GREMLIN and is the first human magician (unlike Mjölnir) from their group to be introduced in the story.

Etymology
Cendrillon is a name that is derived from the French version of Cinderella.

Appearance
Her nationality and language is French. She has blonde hair and white skin. Her body is slender, beautiful, and she had a well-featured face. Her dress gave an image of an ideal girl from a picture book looked like a princess. The dress is made of countless thin membranes placed one on top of another with her body lines clearly visible (compare with Carissa). The only thing out of appearance was figure-correcting underwear binding to her entire body; it seemed like a diving suit that lay at the core of her elegant dress.

Shinyaku Toaru Majutsu no Index
When Leivinia Birdway activated her plan to draw out GREMLIN magicians by having some of her men act as terrorists in GREMLIN's name, Cendrillon was sent to stop them, not knowing that it was a trap set-up by her. During the battle, she uses her Cinderall-based magic against Leivinia's guards, and later showed her knowledge on Kamijou Touma by using him against Hamazura Shiage and Misaka Mikoto's attacks during his attempts to stall for time until Leivinia.

Her domination however, was short-lived, as before she can perform a spell after noticing Accelerator, Leivinia attacks using an jet fuel tanker to keep her down up until Leivina can use the one weakness of her magic. Using Idol Theory, she mimics the arrival of dawn using the explosion of the tanker, weakening her, and releasing the spell on Leivinia's subordinates. She is later caught for interrogation.

Abilities
As Birdway explained Cendrillon used magic transformed the story of Cinderella into an attack spell by overwriting religious motifs into it. By using the fact that an amateur girl was given dancing skills for a ball, Cendrillon could move at high speeds fast enough to casually avoid a cluster bomb dropped near her.
 * Cinderella Attack Spell - Using her foot size of 22.5 cm, any feet smaller than hers will have their bones forcibly widened and if any feet are larger, toes would be severed.
 * High Speed Movement - Cendrillon grants the ability to move quickly based on the concept of the pumpkin carriage that brought Cinderella to the castle.

Other abilities
Her combat skills were also developed to be countermeasures to Kamijou Touma's Imagine Breaker since he can't hit fast enough.

Speculation
Cendrillon is the first magician to have Accelerator contemplate whether or not could his vector manipulation affect or defend against magic. He stated that if it was an attack that was area based or moving along surfaces he would be fine, but if the spell was like cursed straw doll ignoring any distance he would be in trouble.

Weaknessess
Birdway, however, demonstrates the inherent flaw to Cendrillon's spells: the concept of midnight, the same time when the magic placed on Cinderella by her Fairy Godmother wore off. The conditions of midnight like "sunrise" and "a clock that strikes twelve" is enough to render Cendrillon unable to use her abilities, and the conditions can be easily simulated by intense light or manipulating clocks to show 12:00 respectively.