No.18952
When Kamachi Kazuma was asked to write an
Index spinoff manga, he originally had Kuroko as the protagonist. The publisher thought Mikoto would draw more readers so it was scrapped and became
Railgun.
Source:
http://toarumajutsunoindex.wikia.com/wiki/Toaru_Majutsu_no_Index_no_Subete/Dialogue:Kamachi_Kazuma_with_Fuyukawa_Motoi No.18967
>>18965If it's any consoltation, Kuroko and Uiharu basically get their own arc in the manga and Mikoto's barely in it. She's not even on the cover of the most recent volume (or it was the most recent until literally today). Kuroko and the others seem to be getting more focus after ~10 volumes of Mikoto
ditching her friends and trying to fix everything herself.