If Dexter had any emotion at all, who was it more for Deb or Rita
I think it was Deb his sister who he grew up with..It was his moral duty to allways look out for her..
shareHe said at the beginning of the series if he would have feelings for anyone that it would be Deb.
This is pretty much reinforced after she dies it pretty much kills any trace resembling a human being in him.