Please help me with my cosplay!! :)

Hi fellas :)

So I've been going to my national anime con for about 3 years now and this tahun is the first where I intend to cosplay! :)

I'm half way there, I already have a little black dress that I wanna use in my cosplay (similar to the one in the pic) but I need your help in relating this to an anime/video game character. So any ideas? Any characters that wear a little black dress? I can always get lebih accessories, this is just the basis.

Thank anda so much, I'd appreciate it! The con is only a couple months away!