Uh say what?
If you write a story about characters who are not from Johnny's Ent, then go and change the names of your characters into those of Johnny's Ent, your story is either:
a) contains 2D characters with absolutely no character development so that the actions and situation can fit a thousand different names
or
b) completely OCC from the Johnny's Ent fandom that it's not even funny.
In other words: changing the names of characters in one story to make another story for a different fandom = automatic fail.
a) contains 2D characters with absolutely no character development so that the actions and situation can fit a thousand different names
or
b) completely OCC from the Johnny's Ent fandom that it's not even funny.
In other words: changing the names of characters in one story to make another story for a different fandom = automatic fail.