i can't decide between itachi and sasuke!
itachi; because he is such an amazing brother to sasuke!! his power is incredible, he is the true hero of the naruto series so far - what he did for konoha?!
sasuke; he's been one of my favourite characters since day one. his whole storyline is just painfully sad! i think under all that 'evilness' is a really good person! haha. evil/crazy sasuke is so entertaining to watch, and the odd moments when he's friendly/nice are just wonderful!
i also really like sakura and tsunade; they're both so strong, i think they'll play very important roles during the war!..
Oh! also Suigetsu - he is just hilarious!