Marvel movies were mass culture for about a decade; you might as well be asking "describe a Republican who likes sports" or "Describe a Republican who likes Star Wars."
This. "Likes Marvel movies" includes a slew of movies that were exceptionally popular and well received. If BRTD is trying to find a Republican who continues to loyally support Marvel's steady decline in to trash movies that seem to care more about messaging than quality, yes, that might be more difficult ... but plenty of Democrats are unimpressed with their latest efforts, too.
