What I meant was that Lelouch would have been a completely different person if he had never thought about revenge.(becoming zero is a part of it) I should have said cared only on the part about his concern for Nunnaly (I just realized everyone does know). Thats because the 3 girls like Lelouch for specific reasons, which they either said or are obvious. Shirley mentioned in an episode specifically why she likes Lelouch, and the characteristic that she mentioned is part of the Lelouch who vowed for revenge, who cared about few else, that is why I said she fell in love with the Zero side of Lulu.

C.C. so far has shown no interest in Lelouch himself, except when he expressed his need for her on eps 11 and 12. I interpret this is the reason she has started developing feelings for him. It doesnt matter that she knows about all his sides. What I meant by Zero isnt just the masked persona he dons, but rather the Lelouch who is bent on revenge. I never said anything about never having geass, since it wasnt geass that changed Lelouch as a person, but his desire for revenge since long ago. The chess playing, grand scheming lelouch was born from this.

And C.C. definitely likes lulu, or at least has started to like him. It is obvious with the slight change in her demeanor towards lulu.

Other than that, I think Shirley would treat lulu just as another classmate since without his vengeance plot he would be much less mysterious, Karen wouldnt care if he existed, C.C. (if she still chose Lelouch and gave him geass) wont get the chance to be needed, and simply use lulu and be over with it. Suzaku would still be boring, and so would Lelouch.

I am of course basing my image of the non revenge seeking Lelouch from how he acts with Nunnaly. I assume since he doesnt want her to be involved, he tries to act as he did even before the tragedy that befell them (the kind Onii-san Lulu).