What I'm gonna mention will most likely be Shojo (so that means almost all of it are romance) cause the main lead must be a girl. I hope you won't mind. XD
Shinshi Doumei Cross (basically all Tanemura Arina's)
Hana to Akuma
Gakuen Alice
Shiawase Kissa Sanchoume
Oresama teacher
Moe Kare
Goong...
