Rosario + Vampire if you're looking for a forbidden romance that's a boy x a s**t ton of demons.
The ecchis a little cheesy and overused but if you get used to it, it's not that bad of an anime I guess...
Btw, Chobits was the s**t. emotion_kirakira I read the whole manga in two days.
Also, more ecchi, but there's a newer one called Highschool DxD that from what I've seen seems to be a boy x a devil girl. But again, off the charts ecchi.
As for more shoujo series, there's Heart no Kuni no Alice...? Though, it's only in a manga form. A movie came out for it probably 1 -2 years ago but I haven't seen it in subs yet. It's basically Alice in Wonderland with all of the animals (March Hare, Chesire Cat, White Rabbit, etc) all humanfied. And everybody always ships the lead with the Chesire Cat or... 'Boris' if that's a way to put it.
I like Peter, the white rabbit. He's adorbs. emotion_kirakira