>>150091530
Superman, Batman, Spider-Man, they can all work about as well. Superman had a cameo in I Love Lucy and fought Muhammad Ali. While other characters and actors had cameos in Batman ever since the 1966 series, even him crossing over with Scooby Doo multiple times, it's become common to see Batman inserted into basically anything and everything. It's not because he's a more flexible character, he's just had a much longer track record of being DCs crossover guy since The Brave and The Bold pretty much became just a way to use Batman's popularity to try to boost the sales of their other characters.

Superman can do it too, he's just not as popular anymore, so he doesn't get the chance.