[Endoperez]

Conceptual Balance can be downloaded in parts, one of which is Pretenders. It doesn't add any, but you could say that it gives you more forms to work with, since it improves ones like Lord of the Gates or Lord of War.

Mytheology adds a lot of pretenders, but that's the only other collection I remember. I should try it again, now that it has Aku, I just realized I had forgotten all about that.

There are also few mods that add a single pretender, at least my Anansi for MA Machaka and the new Deep Dagon mod.