Shoujo, most of CLAMP stories are of this genre, but despite the so called romantic and fluffy genre there is a lot of dark and questionable stuff in their works which make them some of my favourite authors.
From Cardcaptor Sakura
To x1999
...17 years and i'm still waiting for this manga to come back
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There is also Fruits Basket, one of my favourite series that is getting a remake, this time following the story of the manga; i like the 2001 series but as adaptation it really sucks x')
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A thread about shoujo without any mention of Sailor Moon and Candy Candy should be illegal so here it is ~
The 90's was such a good era, the amount of anime was incredible :')
Note: If you give Candy Candy a try keep in mind that this series is from the 70's and there is a lot of tropes that didn't age well