I think for me the anime or characters that always seem to make me smile and Chi from Chobits, Haruka from Nogizaka Haruka no himitsuu, Kaoru (cuz he's such a sweet gentlemen) and Aoi from Ai Yori Aoshi. Those are the ones that really come to mind. Oh and Ayu from Kanon as well heh
nothing warms the heart better than a romantic anime :)