I made a character that is more fun that I thought it was going to be called Captain Marvels. Marvels being plural. Basically during combat it turns into every incarnation of a character that used the name Captain Marvel. The original Billy Batson, I have Mary Marvel (A bit of a cheat but I wanted to balance the Marvel comics version), I have the original Marvel Comics version of Captain Marvel or Mar-Vell. I have the Danvers version of Captain/Ms Marvel, I have the original female Captain Marvel Monica Rambeau, I even have a very obscure version that of a character that was able to split his limbs off. So at level 1 I was able to put in 4 costumes at once which includes gender changes if you go to the surgeon. I had to open one slot and found out there is a limit of free costume changes for a bit.
But if you want to have a secret identity character be sure to look up the macros on how to switch costumes with effects. I did one video that does this but it triggers when they fly showing an alternate costume with wings. You want the CCE command which has a cool transition option as opposed to the CC command which just change costumes with no frills. Just remember the first slot you is slot 0.
It might be an interesting side diversion if they came up with some missions for secret identities. IE Peter Parker having to go out take pictures of something (then something happens that needs Spiderman) kinds of things.
Not sure if it's poossible but it would be cool if they could figure out a way to bring in speach synthesis into the game for characters to talk in audio. I heard some speech synthesis that is good enough at times to fool people to think it is a person at times.