It is hard to point to a specific example now, but there is something of a trope of an old aristocrat who has deeply conservative and anti-democratic views but opposes the fascists because his sense of propriety and social order is upset by the grubby populism of the fascists and that buffoon, Hitler. I believe the model for this is often Claus von Stauffenberg and the July Plot more generally, but also as I understand that plot was less about ideological anti-fascism than about particular strategic concerns.
Beyond that I have heard everything from the German/Italian old aristocracy being enthusiastic supporters of the new fascist movements, to their sidelining being vital to the movements' success.
A large part of the German Catholic nobility, that is to say Bavarian and Austrian, was opposed to Nazism, I am thinking of the Habsburgs and the Wittelsbachs. Ditto for Italy, especially with regard to the black nobility, who have always been loyal only to the Pope, even if fascism did not have that neo-pagan component that scandalized German Catholics. Vittorio Emanuele of Savoy himself, King of Italy, was never a supporter of his prime minister Mussolini, except that as a constitutional king he was obliged to sign the laws, but as soon as it was possible he tried to get rid of the Duce. I would like to remind you that a daughter of the King, Princess Mafalda of Savoy, among other things married to a German prince Philipp von Hessen-Kassel, died in an extermination camp as a prisoner of the Nazis. In short, although there were many nobles, who also given the strong appeal that the military tradition exercised in certain families, were fascists and Nazis, at the same time it cannot be denied that there was also a hard core of resistance.