Accelerator is an antagonist-turned-hero in the A Certain Magical Indexfranchise and one of the main protagonists of the series. Specifically, he is one of the main protagonists in A Certain Magical Index, an antagonist in A Certain Scientific Railgun, the main protagonist of A Certain Scientific Accelerator, one of 3 main protagonists of the World War 3 arc alongside Shiage Hamazura and Touma Kamijou. He is Academy City's most powerful esper, and one of seven Level 5s.