This is definitely a conversation starter....LOL.
I <3 all of the characters for different reasons but my favorite is between Kyo and Tohru.
I don't know who I like more but I think I also like them the best because they both <3 each other deeply and it makes me interested most in them....
I've noticed because the manga goes so in depth on all of the characters that it has somewhat pulled away from their relationship in some chapters which makes me sad....but its ok! It doesn't fail to pick back on them when you do read back on them.