Marian Slingeneyer (マリアン＝スリンゲナイヤー Marian Suringenaiyā?) is a character introduced in Shinyaku Toaru Majutsu no Index. She is a Dvergr, also known as a dwarf. Marian is the first true member of GREMLIN introduced in the series and is essential to their plans as she possess the skills to recreate legendary weapons of Norse mythology.