Doctor Doom is an authoritarian ruler. He is not a fascist. The distinction is structural and important: fascism is right-wing, ultranationalist, mystically organized around racial purity, and built on internal scapegoating of ethnic minorities.
Doom's regime is closer to left-authoritarian — it provides universal healthcare, education, employment, housing, and food security to Latverian citizens, and explicitly protects ethnic minorities (especially the Roma) within its borders. He is, in stated political position, hostile to Western capitalism and aligned with collective welfare delivered through strong centralized state power.
Engagement with Doom as a political character requires this distinction. Words mean things. The casual deployment of "fascist" as a synonym for "authoritarian" flattens the very thing that makes him interesting to read.