I'm not a big fan of the fillers but some are actually pretty nice. I'm reading the manga as well and it makes me wanna see Shippuden so bad. D:
My favorites are;
Naruto - He needs more love. I don't get why most don't like him. Well yes he goes on and on about the Hokage-stuff but Sasuke is worse.O.o;
Hinata- She's so awsome, her blushes are too cute! Njuu! Her seiyuu is one of my favorites as well.*x*
Rock Lee - Softie~!! Love his and Gai-sensei's bond. ;_;. Also
Drunken Rock Lee is ftw <3!
Gaara - His childhood makes me cry. He's really cool and he has probably developed the most as a character! x3
Shikamaru - Love him. His personality is unique. <3
Dont read if you haven't read the recent manga chapters -->
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I loved how he did everything for Asuma-sensei when he died. It was very sweet and made me like Shikamaru even more <3.;__;
I have nothing against Sasuke, but well he isn't one of my favorite ones. Sakura has changed but she's still annoying D:<.