Classification: Esper
Occupation: Tokiwadai Middle School (Former Student)
Ability: Mental Stinger
Level: 3

She is the main antagonist of Volume 11 and represents a contrast to both Shokuhou Misaki's situation and character.

Mitsuari Ayu has long, wavy, chocolate-colored hair, apparently as fluffy as cotton candy. She has smaller breasts than Shokuhou Misaki but apparently has more beautiful legs than her, more than just long and slender. She wears a special dark suit, resembling a racing swimsuit, with similar gloves and boots.

Mitsuari Ayu's character design is basically the rejected initial design for Shokuhou Misaki, with a few changes to her expressions due to her psychotic 'yandere' tendencies.

In the past, Mitsuari Ayu and Shokuhou Misaki were found by Tree Diagram to both have the possibility of reaching Level 5, possessing abilities with a near identical basic theory and scope, though they would plateau at Level 3 under standard curriculum. The higher-ups decided to prune one and focus on developing the other. Following the Parameter List, they chose to focus on Shokuhou Misaki, with Mitsuari Ayu being kept as a back-up in the event of her death.

A year before the current year of the Story Timeline, Mitsuari Ayu had encountered Kamijou Touma. At that time, her circumstances had driven her to consider suicide. When she was about to go through with it, she sent a message to Touma, hoping that he would save her. However due to bumping into Shokuhou Misaki at an intersection, Touma lost his phone and as such was unable to reach her in time.Though her suicide attempt at Ground Geo failed, Ayu was drawn into Academy City's dark side and came to resent Misaki not just for stealing her chance to become Level 5, but also for being saved when she wasn't.

(Source: toarumajutsunoindex.wikia.com)

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