Yes, when you rename a class you need to set up a redirect so that the linker can point to the correct root when it is loading existing objects.
For a “simple” case like yours with renaming a class you will need to add just the ActiveClassRedirect. Something like:
+ActiveGameNameRedirects=(OldClassName=“RealLifeCharacter”,NewClassName=“DefaultCharacter”)
If there are any existing redirects that point to RealLifeCharacter as the NewClassName, you’ll want to switch those to be DefaultCharacter as well.