Gosh, I don't know. I can't seem to think of character in Bleach I don't love. I started out as a huge fan of Gin, and I grew all the more fond of him when I watched those short flashbacks of him and Rangiku. He seems very, um, misunderstood. And I like misunderstood people. ^^;; Also, the fact that he speaks Kansai-ben makes him appeal to me all the more.
Oh, and I absolutely love Shuuhei because he oozes coolness, except that he doesn't get much screen time, and I've yet to see him release his zanpakuto. Blehhh. Urahara's cool too (and uber hot!) but gee, I wish we got to see him fight more or get a glimpse of his bankai.