I like both Rukia and Ishida.
Rukia because...well, because she's her (sorry if it's wrong grammar...I can't think straight at the moment). Cool but cute...it's especially funny the way she draws...hehehah!
And Ishida because he's also cool but loveable. Teehee, imagine a cool-aura, dangerous-looking guy who sews...it's amusing! This, I think, is the first time I've encountered such a character.