This is ridiculous anyway, both Index and Mikoto are featured prominently throughout the story more so than the other characters which makes them main characters.
As a testament to this, just ask anyone "Who are the main characters in Toaru?"
For Index - Touma, Index, Mikoto, Accelerator
For Railgun - Mikoto, Kuroko, Uiharu, Saten
Without thinking, most people would give you those answers. If you can reach this status, you're a main character- Realize that out of those 4, Accelerator didn't start out as one, but over time people like him and he got featured more and more. Elevating him to 'Lead' Character status telling his own story.
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