These are great. I especially like He of the Ivory Throne - I don't remember him from the original mythos, but your description reminds me of that Lovecraft/Evangelion story, Children of An Elder God, where they describe him as a kooshball.

Since you did Dagon and Hydra, any chance for a Spawn of Azathoth? I don't remember their powers off the top of my head, just that they're some kinda comet-like things that break off of Azathoth, hit a world, and devour that world, becoming a lesser form of the Demon Sultan in the process.

One thing you might think of doing is putting links to your previous threads in your latest ones, to make sure nobody misses anything.