I don't mind guest characters (to an extent), but I still don't get why put 2 evil Superman characters in the same game, let alone the same roster? It just doesn't make sense except for recency bias. I admit that I'll probably ask for something like Pennywise, Pyramid Head from Silent Hill, Pinhead (the non-troon version, even if transgenderism fits with Pinhead's theme), Doom Guy, Carl Johnson, etc. Variety is very necessary.
Hell, I'd probably ask for Xena the Warrior Princess, or Beatrix Kiddo (The Bride from Kill Bill, for the uninitiated), but I know this game's track record with the female form altogether since MK11.