Sonic Shower Thought: If a super advanced race planted the seeds for humanoid life throughout the galaxy, one of their DNA contributors must have looked like Jeffrey Combs.
That or there is one long lived alien out there banging his way through the quadrants... Either way, we know what he looks like.
Yeah. Or they're separate changelings, but they all had the same "disguise 101" changeling professor, who was, of course, played by Jeffrey Combs. There's hope that Lower Decks could make one of these theories into canon.
I hope they do an episode where he plays every character they meet. Maybe he can be a character like Mr. Smith from the Matrix that keeps taking over the bodies of everyone they encounter