>>11227950You've already mentioned the Undead Builder in the Necro wave and the heads pack from the All Star 6 wave, and it looks like you've got the Frankenstein Hagnon head.
So, from the Necro wave:
Belualyth comes with two different heads, and is a 2.0 sized head so she will fit on the black Cosmic Legion Builder, but her hair will likely get in the way from fitting properly unless you customise it a bit.
Maxillius comes with a normal skull and the eyeless skull.
Turpiculli has two different monstrous skulls.
If you want a skeleton in a spacesuit wearing a chainmail hood, Sir Elijah comes with a skull face plate.
All Stars 6 has the Skeleton Raider, Thorasis, and Skalli the dwarf skeleton, but they all have medieval helmets on, so they might look anachronistic. Clavian the red skeleton is also getting reissued in that wave.
Graveyard Skeleton 4 pack has skull masks so your skeletons can disguise themselves as skeletons.
As for other creatures of the night, there have been a few vampires, though some will be harder to find now. The Illythia wave had Baron Volligar and Varrg. Vallak has a hood molded to his head, and Illythia has long hair, so she might have the same issue as Belualyth.
There was also Carpathias from much earlier in the line, and Lord Dragul had the same head painted slightly different. The Vampire Knight (2.0 buck) from the second Kickstarter.
And there was a head pack with a vampire head in the All Star 5 wave, and that will be much easier to get than any of the other vamp heads I mentioned.
Finally, Poxxus has a pretty cool undead head with a long beard, and it looks like the beard will clear the front of the chest of the TUSCC spacesuit body.
And Demistros has a cool bony demon head too.
And Red Death.
And the other anon that replied to you had good suggestions too. The Scaphoid dayglow yellow and green skull will look awesome as an irradiated phantom spaceman. He won't be too hard to find since he was reissued not too long ago.