OMG where do I start??!! It's my favourite genre of manga EVER!!!
Pichi Pichi Pitch: Mermaid Melody
Cardcaptor Sakura
Shugo Chara
Kamichama Karin
Kamichama Karin Chu
Pita Ten
Ah My Goddess
Time Stranger Kyoko
The Gentlemen's Alliance
Kamikaze Kaito Jeanne
Sailor Moon
Fushigi Yugi
Fushigi Yugi: Genbu Kaiden
...To name but a few!