Azmadon
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No one is forbidding creatures; I recommend mentioning "musclemen in loincloths" less often – it's off-putting, and it's embarrassing to respond to such messages. It makes you think you've ended up on the wrong website. It's pure cringe, and even now, I feel uncomfortable writing this message.
It all seems like some kind of joke; it's like the goose/phoenix is conducting social experiments again under a new nickname, checking if "gachi monsters" can bring people back to the forum.
The idea itself is not bad because there are people interested in more or less "brutal" units. As far as I know, you are more knowledgeable about the Undead and less about Demons (and their concept).
The main thing here is to avoid extremes. And, in my opinion, a huge Knight (not necessarily a human) in brutal armor with a lot of attachments (spikes/horns/chains, etc.) will look no less impressive than a naturally muscular Demon-Gigachad, with spikes, fire, and so on.
«Кто хочет, тот ищет возможности, кто не хочет — ищет причины»