well, Haircolor/style... Long and (preferably) straight dark hair is my fav by far (my sig, Haru and Tsugumi as example)! As for body build and sizes, dunno just something normal/average.
And yes, that's right... I'm bringing a boring and probably too normal opinion in this topic, haha. There will be no 'physically aggressive tsundere', 'non loli kuudere', etc... from me