I used to like Misaka a bit when I saw Index, but after watching Railgun, Kuroko is the number one most entertaining and hilarious character in the anime. The reason is because her character is so exaggerated and extreme. It's a trip watching Kuroko doing her yuri antics and let's also not forget it's also because of the seiyu voicing for Kuroko.
Miss
Satomi ARAI is one of my favorite seiyu's.