I've just finished watching To Aru Kagaku no Railgun, following both seasons of To Aru Majutsu no Index, which I have to say are both awesome.
Both shows, set in the same universe, have a huge number of characters. I think the creators did a really good job with the character designs, because they're all distinguishable and unique in their own way. I thought the frog-faced doctor, the Heaven Canceller, was hilarious, and even more so when Misaka mistook him for a real-life Gekota (which I'm guessing means frog, or something). I liked Index, Misaka 10032, and Himegami Aisa, and Last Order, who are all adorable, and Misaka Mokoto herself, of course. Kuroko Shirai is FREAKING HILARIOUS. Saten Ruiko has a really nice voice (actress).
What I liked about Index was the way they merged magic and science. It's a very interesting system, and like the universe itself, was quite well-balanced. The graphics for both were amazingly well done. Loved all the magic circles and battle nuns and crystal ships and everything. The world was complete and cohesive, with nary a plot hole anywhere. That's my kind of universe.
Railgun ended nicely, which gave me that heart-accelerant feeling that I now associate with brilliant stories. When I was done, I thought it was a bit demoralising to realise that I don't have that kind of really close friend, the kind that you can call up during guard duty to talk without feeling like you're bothering them. But my friends are awesome in their own other ways, so I don't think I should be complaining. Besides, they're all not girls, so.
And there still isn't any Index season 3 or Railgun season 2.
The Edna Man