I genuinely didn’t know the answer to the questions of “What’s the plural of Batman?” It took on a life of it’s own as I did a little research. I was under the impression that Batman was correct, saying that there’s only one true Batman. But there have been loads of other Batmans… Batmen? Especially if you count any of the alt-universe Batmen.
What I like most about this strip though, are the two civilians and their idiocy. They start out as fans of comic books, but by the end of the strip they turn into naive Gotham citizens. They know all the other Batmen except the original.
Plus the fact Bruce Wayne breaks his own cardinal “no killing” rule in order to keep his secret intact.