This one might come as a surprise but I have to go with the entire Ouran High School Host Club. Now I'm a straight male but I know good manners when I see them and the host club (although sometimes crazy) has them.
If I had to choose one it would of course be the ever so charming Haruhi Fujioka. She's the most normal of all the host club members and the sweetest too.
Better have some cake around or there could be trouble, we don't won't to make Honey mad. @VinMcCarthy