Catching up:
Terminus- I love the idea of a figure of him, but I know I have neither the money nor the space for a figure of him done properly.
Devil Dinosaur- While the same applies here as it did to Terminus, this one would be harder for me to resist. I loved this comic as a kid, and it's one of Jack Kirby's most underrated works. I definitely don't have room for a T-Rex that would be in scale, and I doubt I'd be able to afford it at today's prices, but damn would it be hard for me to NOT buy the big red dude.
I'm not familiar with the modern iteration with Moon Girl, but I definitely think that IF DD was made they'd need to do both MG & MB. I know there are fans of both eras, and Devil Dinosaur being such a cult favorite I'd think he'd need to have both companions packed in.