Whenever HAREM is the key word there is only one name to the root of it all "TENCHI MASAKI".
And yes Tsukune's harem is decent, though the girls are youkai's, there sincerity is quite pure and honest. Good thing they heal fast whenever they fight, blood is everywhere. It's either Tsukune's or the other girls. They girls take on "Ryoko" that would risk herself and her own body for the guy she likes/loves. Now the only problem is Kokoa, how will Ikeda include her since she's not yet interested in Tsukune. Though she likes licking his blood. lol.