Possible story twists

After looking at some of our past history during each time period I came up with some ideas as to what could be a possible alteration of what could happen in our history and by using the information of existing characters by merging them.

Also as I am unclear and unsure of what idea I am doing I have gone through some ideas and ran them past other students to see which they think would be fun to look at or re-imagine.

*Blue Beetle vs Catwoman in Ancient Egypt. Both are highly worshipped in Egypt, possible to have them intertwine.

*Robin vs Captain Boomerang in Rome. Captain Boomerang challenges Robin to a fight in the Roman Coliseum.

*Aquaman vs Scarecrow in Venice during the great flood due to the black death caused by an experimental fear toxin.

*Aquaman vs Killer Croc in Venice. After the great flood Aquaman accidentally woke up the slumbering beast that now terrorises Venice.

*Batman vs Joker in Medieval times. Joker is actually a Jester who manipulates the king and Batman fights to break up a corruptive government.

*Green Arrow vs Joker in Medieval times. Joker is actually a Jester who corrupts the king and Green Arrow is fighter of peace for all religions.

*Flash vs Deadshot in WWI or WWII. Deadshot is a Nazi sniper hired to kill the fastest man in the world.

*Superman vs Mister Freeze during the cold war. Both nations are looking to overpower the other but only one can rule. 

After going through this list with some students and going through the different ideas individually and seeing the amount of depth that would be possible to go into, or how possible and creative the link between the characters and the history could work.