Mitsuari Ayu (蜜蟻愛愉 Mitsuari Ayu) is a character introduced in Shinyaku Toaru Majutsu no Index. A Level 3 esper with the ability Mental Stinger, she bears an immense grudge against Shokuhou Misaki, who was chosen over her to be developed into a Level 5 and was saved by Kamijou Touma instead of her.