I'd have to say either L or Rem both from Death Note. L is such a unique, interesting genius character and adds a lot to the show. But I really do admire Rem's protectiveness of Misa. She is always there for Misa and does anything to ensure her happiness and safety.
I think Sebastian from Black Butler is pretty awesome. He always does the most unexpected things. When you think that he's become as cool as he can gets cooler. His character really surprises me more and more and made my jaw drop multiple times.
I also like Luffy from One Piece. Hes so simple minded that you love his character but the problem is I don't think he's complex enough to really connect with you.
Oh goodness, how to decide? Maybe L from Death Note because he's a genius and you don't know what to expect. Maybe Ceil from Black Butler because he's so different than most anime characters I'm used to and has an interesting history.
Gene Starwind from the anime Outlaw Star. I liked how he had serious personality flaws that got him into trouble and how he had to overcome those flaws in order to help the people he grows to care about.
Apologies in advance if the picture doesn't post right.