I think the Goldberg WCW nitro code making him stronger was a great idea to simulate the "unbeatable" WCW run he had.
I believe some similar code for other wrestlers that have an "unbeatable" run for several years could benefit from such a thing, no idea how hard it can be as these kind of codes are way over my head but maybe in the future if someone can figure them out it could be a good addition to the gameplay.
The Undertaker in the Wrestlemania arenas would be a good idea to simulate his "unbeatable"
long winning streak on it, would make sense to make him stronger on this arena so when you face the Undertaker AI on WM you really have a big challenge there.
André the Giant was supposed to have a
15 years undefeated before going against Hogan at WM3 (though it was for storyline purpose, in truth he had lost a few matches, but still won the heavy majority of them).
But i'm not sure what arena André the Giant should be made stronger.
Ric Flair with
16 to 25 world champion titles, is the most titled wrestler ever (with world champions belt i mean), maybe that should be reflected when taking on him in an specific arena, but again no idea which one it should be, maybe one day a NWA arena is made as by default you have set Ric Flair as the current NWA champion there
Faboulous Moolah had a very long
champion reign with a couple of defeat in between (but keyfabe was undefeated for near 28 years), but no idea which arena she should be made stronger on.
Same with Bruno Sammartino, undefeated champion
for 8 years too, i think that should be another candidate for such code, no idea for which arena unfortunately.
Steve "Dr Death" Williams went undefeated
for 10 years , lost his streak when in ECW , maybe it could be made stronger there, so the player wanting to re-enact Williams loss of his record would have to work it a lot.
Hulk Hogan
"Hulkamania" years after Rocky 3 is what actually put wrestling on the mass popularity map in the whole world, i think there should be a version of Hogan that is made stronger to simulate this giant push he had there, maybe the arena that gives him the classic eighties attire should be the one subject to making Hogan stronger.
I'm sure there are more of those "unbeatable" wrestler that could make it more fun to challenge them on a specific arena with this kind of code