Yes I love Elfen Lied! But I 10000% agree with you some of them scenes are just like ....no..... Too bad it got cancelled and they never finished it D:
Other good that I fell in love with are :
Rosario + Vampire (BEST ANIME EVER) but it got cancelled too
High school of the dead. AMAZING zombie anime!!! BUUUT it got cancelled too
Highschool DxD is another good one! But I think it got cancelled as well.......
Just like Elfen Lied these are adult animes. Just a heads up.