Figure 1- The skulls of Dimetrodon (left), Daemonosaurus (center), and it's supposed descendant Tyrannosaurus (right). Notice that Daemonosaurus has a hooked jaw and that they differing teeth.
So, in a certain post someone have said that Daemonosaurus is a basal theropod. Well that is far from the truth because in the GVFT it is nested as a relative to Dimetrodon thus making it a synapsid, thus making it far from theropoda and into synapsida, into the sphenacodontidae, of which it nests a bipedal relic from the Permian. As it turns out Daemonosaurus was not a dinosaur after all.
Figure 2- Speculative Adult Daemonosaurus (a.k.a. Badogaturamalitatosaurus) art by best paleoartist friend FreddyFan95.
In Figure 1 we see that both it and Dimetrodon have differing teeth and not T. rex, but also eyes of Daemonosaurus look pretty big thus implying that it is a juvenile of another creature.
In Figure 2, we see what an adult Daemonosaurus could look like, notice that it has the hooked jaw, and that it is bipedal as it is the only bipedal sphenacodontid.
So, the long thought to be early theropod Daemonosaurus wasn't actually a theropod at all, but instead a sphenacodontid, and that it is probably a juvenile to much bigger animal that might've been an apex predator of it's environment.