Well, hope Little Busters encourages you to check out future (or past) Key works.
And Kuroko-- Ah, the banshee's wail.
I mean Kuroko's actually pretty cute looking and dare I say it, attractive. But for some reason they casted her voice as a 70 year old granny, and voice is so indicative. Although I thought she was okay in Index proper. Railgun played up the perverted old granny role too much.
Season 2 though I hear has much less filler. Also, there's an entire Index movie coming out, and I guess people can stop bashing JC staff.