I have been messing with MidJourney a little, but with a little different art style than what has been posted.
I have been having it generate a comic-book character named "Mudbug", done in different styles of actual comic artists. The cool thing I have noticed with the prompts is seeing the difference when telling it that Mudbug should either be a superhero or a supervillain.
Mudbug in the style of Jim Lee:
Mudbug in the style of Todd McFarlane:
Mudbug in the style of Rob Liefeld: