The great thing about the Tzenkethi is that canon Star Trek tells us absolutely nothing about them exceptthat their leader is called "the autarch" and they run a oretty unsavory empire, so the writers of various novels and comics and games have just filled them in with contradictory details; oh they have a rigid hierarchy, oh they're basically dinosaurs, oh they're eugenicists.
Anyway, you just know that of they ever flesh them out in canon, they're just going to be the usual angry rubber-forehead aliens.










