Dark and creepy?? Heh here you go

1.Evangelion
2.Serial Experiment Lain
3.Ninja Scroll (well i think)
4.Nadesico isn't really creepy but it has a dark plot line
5.Slayers once again a dark plotline...very enjoyable to watch.
6.Tsukihime
7.Noir well not so much but good to watch


Thats what i can come up with from the top of my head for now
I will get back to you more tomorrow!