Oriana Thomson (オリアナ＝トムソン Oriana Tomuson?) is character introduced in Toaru Majutsu no Index. She is a magician who was born in England and works as a mercenary. A woman who truly wants to help people, she originally served as one of the main Magic side antagonist of the Daihasei Festival Arc in Index, alongisde Lidvia Lorenzetti. After her capture, she brokers a deal with Necessarius and works for them in order to help people during the chaos created by the increasing tensions between Academy City and the Roman Catholic Church