Headband Girl

Headband girl is a recurring background character in Toaru Majutsu no Index. Originally only exclusively appearing in the novels, she later appears in both manga and anime adapations of the series. She acts an easter egg in the series and exclusively appears in illustrations where Kamijou Touma's class from A Certain Highschool is involved alongside Spiky-haired glasses girl who is apparently her friend..

Appearance
In the original light novels, she is a brunette with short hair that never reaches the shoulders like bowl cut. Her most prominent feature is her headband tucked over several of her fringes. He appearance in the manga is retained. However, in the anime adaptation, her hair becomes thicker and longer.

Toaru Majutsu no Index Light Novel Volume SS2

 * Main article:Toaru Majutsu no Index Light Novel Volume SS2

She appears in the background as Kumokawa Seria talks to drenched Kamijou Touma.

Kazakiri Hyouka Arc

 * Main article:Kazakiri Hyouka Arc

In her debut, she is featured in the colored illustration of the scene where Index first appears in Touma's class. She sits in front of Touma in the illustration next to wall adjacent to the halls.

In the manga adaptation, she first appears alongside the glasses girl as Touma checks the classroom to see if his class would notice he has lost his memories.

Daihasei Festival Arc (Index)

 * Main article:Daihasei Festival Arc (Index)

She appears in the background in one of the colored illustrations depicting the scene where Touma accidentally drenches Fukiyose Seiri with water.

In the anime adaptation, she is part of the group of classmates that Touma rouses to defeat a more powerful rivaling school whose teacher insulted Tsukuyomi Komoe, and is later successful in defeating them.

Skill-Out Uprising

 * Main article:Skill-Out Uprising

She is present in both the colored novel illustration and the anime as part of the class in their organized eat out in a sukiyaki shop.

Acqua of the Back Arc

 * Main article:Acqua of the Back Arc

She is in the colored illustration depicting where Index, Misaka Mikoto, and Itsuwa meet each other in the public bath in School District 22.

Ichihanaran Festival Arc

 * Main article:Ichihanaran Festival Arc

She appears in the front cover of the 5th Shinyaku Toaru Majutsu no Index novel alongside Thor and Touma, apparently busy with Ichihanaransai, making her the only unnamed character to be featured in a cover.

Toaru Majutsu no Index SS: Love Letter Competition

 * Main article:Toaru Majutsu no Index SS: Love Letter Competition

She is in the background peering alongside Himegami Aisa in the only illustration in the story when Kumokaw Seria arrives in their class to ask for someone to deliver a letter to Touma, who is missing.