In the US and Europe, the embodiment of evil would have been The Kaiser (Frederick William Victor Albert, Kaiser of Germany and King of Prussia) and/or “The Hun” (the Germans, not Attila).
Every book I’ve read from the 19th century, from Europe, mentions Napoleon. I’ve often mentioned that he seems to have been the Hitler of his time (in terms of, “that dude who everything should be compared to”, not in terms of, “the true face of evil”.)
Minor nitpick: 1933 wouldn’t be the cutoff year, Hitler wasn’t considered exceptionally bad at that time - he was an authoritarian ruler who was pushing back at Britain and France and treating the Jews about as badly as Americans treated blacks. Lots of people didn’t like him, but it wasn’t unthinkable to be a fan of him (like Henry Ford was) and he didn’t really stand out from a lot of other similar figures. It wasn’t until he started a world war and evidence of death camps and mass executions came out that his name became the synonym for ‘as evil as you can get’ that it is now, which was closer to 1943 than 1933.