Fiddlesticks Direction
Based on the most recent update, I would assume it's probably too late to explore other options, but here's some thoughts:
It was discussed that Fiddlesticks could potentially meet the criteria to be a demon. His name, more than likely something that was made up by a child. Then it went on to discuss how his origins would be unknown. Nay I say!
Unknown origins are boring and don't allow us to sympathize or connect to the champion. Sure, it's neat, but we've already got it in tons of other forms. So here's my pitch:
Farming accident. A man (father probably) is in the barn when a sickle falls and kills him. A scarecrow is built over his grave. The sickle that killed him is placed at the feet of the scarecrow. Every day, a child visits the grave to pay respects. The child names the scarecrow, you guessed it, Fiddlesticks. What the child doesn't know is that the spirit of the man is yet alive, inside the scarecrow. Well, as happens with life, the child grows up and stops visiting the grave. The scarecrow is alone. Ages pass. The scarecrow sees people come and go, living their lives. Over time he becomes envious. Why should he be stuck guarding his own grave when others get to enjoy life? Boom. Demon is born. You guys can do the rest.