Gah!
I managed to read them all, finally. o.o
First off, I have to give props to Sacrifice. o.o You have a new reader in me, and I can't believe I missed that. Something about the writing is just descriptive enough, and it all comes across well. It also was a surprise to me, besides the actual layout of the story, the character personalities. For some reason, I've always imagined Izuna as the nicer half of the Uchiha brothers, so the cold, ruthless personality he has is completely opposite, and for some reason, that compels me to keep reading.
Though, my favorites of them all where IBC and OUD. I think I have to vote for Kiwii this time, though, because I can't choose between the two, but I usually vote for Riku. o.o
All the entries this time were very good. (Though I'm disappointed to see so few votes for Kiwii - like Riku said, the story is well throughout and developed).
Riku edged ahead of the others, because for some odd reason, Derious is a character I instantly liked. And Kiwii's story has a different flare and feel to it, so it stands out - that's why I choose those two above the others.
Regardless, good luck to everyone!