Ther's just always been certain qualities I have been drawn to. I usually tend to like the conflicted character. One who may be gruff on the outside, but has a soft side underneath, and possibly some inner demons / turmoil.
So when I got into Naruto, my favorite character was Kakashi. And I stopped reading for a few years when he didn't show up as much. And in D.Gray-Man, the character I care most about is Cross Marian - but we sure as hell won't see him for a while.
Then I am a sucker for tight fraternal relations. So KinGin caught my attention there. They seemed like the series' closest brothers. They're badass, feared, powerful. But they were two brothers who actually cared about each other and got along well, despite their very different demeanors.