I used to like Deidara the most, solely for the "Art is a blast" thing, but I liked him more when he acted cool during the Gaara Rescue arc than how he was acting all hot-headed after being Edoed. Besides, even before Deidara's reappearance, I read FMA and Kimblee became my #1 favourite mad bomber
Kisame for his death scene. Finally, a major villain dying without talk no jutsu and moreover dying heroically for the villains. That was awesome. His death scene flashbacks were some of the most effective in the entire story
Woah I don't watch Itachi Shippuden so don't know my facts but I didn't know there are that many Akatsuki members! :O
Oh and there are 3 itachis now? Man I need to catch up.
Itachi mostly because of his awesome backstory and troubled life. His personality is the only stoic-ish one that I find particularly intriguing. Wish his rabid fans weren't so trash.