That would no doubt have been an interesting insight into the propaganda machinery of the nazis, but the plain and short answer is that they considered comics filth and more or less forbade them. I'll go into a little more detail below if anyone's interested.

Authors on this issue like to quote a 1940 editorial in Das schwarze Korps, which was the weekly paper of the S.S. - for instance:^1

The editorialist argues that "these fantasies of Jerry Israel Siegel" subverted the "Superman" of Nazi polotics and so sowed "hate, suspicion, evil, laziness, and criminatliy in their young hearts" of "the American youth, who must live in such a poisoned atmosphere and don't even notice the poison they swallow daily."

The nazis had two major reasons to be disgusted by Superman: he was fighting them in the comics, and his creators - Siegel and Shuster - were Jewish. In fact, the term "Superman" is originally a translation of Nietzsche's Übermensch, and though we don't know whether he was intentionally named for it, the point was not lost in the Schwarze Korps. (And not on others, either: the German-American psychologist Fredric Wertham would later argue that Superman was fascist, and his book Seduction of the Innocent in 1954 was one of the major forces behind the American comics industry going into self-regulation.)

But as much as Superman specifically drew ire, the nazis had already placed a de facto ban on comics much earlier. Only weeks after the 1933 federal elections, Goebbels already had the propaganda ministry up and running, and a regulatory agency was formed half a year later which in practice let the nazis ban virtually anything related to culture by requiring membership in the agency in order to be allowed publication. Hence, Germany saw a mass emigration of talent - and whatever had existed in the realm of potential comic book superheros completely perished. Corey Ross^2 gives an excellent brief summary on how this was set up, although without mentioning comic books specifically.

I would use caution in assigning the view of comic books to the nazis explicitly. To be clear, they absolutely considered comics "smut and trash" (Schmutz und Schund), and the de facto ban was theirs. But it's hard to tell to what extent if any there would have been a German comic scene even without the nazis. Schundliteratur as a concept preceded the nazis, for instance in a law from 1926 to 1935 called Gesetz zur Bewahrung der Jugend vor Schund- und Schmutzschriften ("Law for the protection of youth from trash and smut writings"). Even after the war, this view remained:^3

the postwar influx of American comics had only convinced German parents and authorities that the victors possessed a far more impoverished culture than the vanquished.

The author relies heavily on an older (1995) article which explains the workings of the Schundliteratur debate in Germany and is well worth a read if you're interested.^4

That's not to say that the nazis did not use propaganda characters fighting the allies - but not superheros in comic book form, for whom Germany likely wasn't ready anyway.

^1: Gavaler, Christopher. Superhero Comics (Bloomsbury Comics Studies). Bloomsbury Academic, 2017.
^2: Ross, Corey. Media and the Making of Modern Germany: Mass Communications, Society, and Politics from the Empire to the Third Reich. Oxford University Press USA, 2008.
^3: Jancovich, Mark et al. Film and Comic Books. University Press of Mississippi, 2007.
^4: Springman, Luke. Poisoned Hearts, Diseased Minds, and American Pimps: The Language of Censorship in the Schund und Schmutz Debates. The German Quarterly, Vol. 68, No. 4 (Autumn, 1995), pp. 408-429, 1995.