User blog comment:Shermoen95/Trailers?/@comment-4990650-20121217003715/@comment-5879167-20121217012614

Plenty of them.

Skarner, Zilean, Fiddlesticks, Brand, Varus, the mystery behind the lore of champions like Fizz, Nocturne, The Shadow Isles Champions, and The Void champions are all very interesting.

If just reading the story listed under the "Background" tab on this site isn't interesting to you then I suggest reading the Champion Judgements. They offer a lot more insight to the background and thoughts of the characters then the normal stories do.