Mallybath Blackball

Mariebeth Blackball (マリーベート＝ブラックボール) is a Witch of Anglican Church, and operates under the command of Stiyl Magnus. She makes her debut in Toaru Majutsu no Index Movie: Miracle of Endymion with two others, Marye Spearhead, and Jane Elves.

Appearance
She appears as a young lady with shoulder length wavy red hair. She wears a bowler hat with a ribbon on top. Her outfit is the least revealing among her partners. Instead of wearing a skirt like Marye, she wears breeches, covering all most of her legs, exposing her white stockings. Her robes is the most loose of all, and her white cape covers much of her upper torso.

Unlike the other two witches, she wears a high cut slip-on shoe with a ribbon on top with a thick heel.

Background
Little is known about her, but Mariebeth and Jane seem to be subordinate to Marye. She seems to be under Stiyl, referring to him as "teacher," which implies some sort of master–apprentice relationship between them.

Chronology

 * Main article:Toaru Majutsu no Index Movie: Miracle of Endymion

She and the others first appear monitoring Meigo Alisa while she is with Kamijou Touma and Index in the batting cages. She hides underground while Marye attacks Touma and company. Appearing from beneath, she quickly traps Touma in order for Marye and Jane to take him down. Despite their coordinated attack, they are unable to contend against the combined power and Touma and Index. She is blown away by the force of Imagine Breaker negating her magic.

She is later rescued by Stiyl alongside Marye, chastising them for attacking. They later aid Stiyl against the arrival of the Black Crow Unit or the Civil Affairs Resolution Mediation Unit commanded by Shoutaura Sequenzia. They are utterly no match for them however, and are forced to retreat after Kanzaki Kaori demands them to.

Abilites
Mariebeth's abilites are linked to earth, seemingly, like the other two, through the use of her feather pen. She requires for her to touch the ground, at which point the rocks just out and traps the target. Her powers are most effective with her teammates. Like Marye, she seems to have the ability to hide with her element; she can apparently hide underground an indefinite amount of time.

Character Art Designs
According to Haimura Kiyotaka, Mariebeth was designed around the motif of a detective.