Blood+, Ergo Proxy Recommendations
If you were dissapointed by Blood+ like I was comparing it to the preview and what I expected, you should really try Ergo Proxy. It has many things that Blood+ would never have, although if you would here the story for both of them, you could barely differentiate them, and I'm talking about the atmosphere here. Ergo has the truly dark sceneries, ravages and atmosphere that you'd expect in Blood+, the conspiracy level is way higher and a lot less stereotipical and the difference of levels to what basicly exists in both would continue.
Strong entities who kill each other.
Humans who have to deal with god like mysterious powerfull creatures in the same way.