How do I change the display name of a non-maincharacter in limelight without having to make more than one of that character?

I don’t know if there’s a script for it, but I’ve seen people have that in their stories before.

Go to your character list and you can change the display name there

Would it be able to change in the middle of the series from one name to another?

No you would have to make a duplicate of the character otherwise the name will change

Got it. Thanks for your help.