Dyfed is MTG's take on Cupcakke who got enamoured by a fascist psychopath and got lobotomised. What an outing for the first black woman in the game.

...I think you lost me. Can you elaborate?

I have no idea what you're talking about, but I want to point out that The Thran was published in 1999.
At the very least both Sisay and Jolrael predate Dyfed.

The main issue with that is that Yawgmoth really wasn't a fascist. Fascism is about the merger of state and corporations, usually with a traditional flair, and Yawgmoth was far from a traditionalist. Nor was he really a corporatist. With his utilization of the lower classes, he comes across more of a communist. I would've said nazi with a lot of his racist experimentation (since the ideological difference between Nazism and Communism is race vs class), but communism tends to share that de facto but not as a primary trait (Uyghurs, Ukranians, etc). Granted, the systems that come out of facism, communism and nazism tend to be similar in execution, but the fascist ideology is a bit more different from the two extreme socialist ones.

Ideologically he's an unholy mixture of nazism with Victorian eugenics. But he is meant to be a soviet analogue, given how he's compared to Stalin

Nonsense, Yawgmoth is very clearly an homage to Davros, who of course was in no way an allegory nor grounded in any study of history