is it possible to change the way the MC refers to Suzy without having to start a new game?
If you know how to use unRen, yes.
Quoting myself from a post in the Discord's help channel:
You want to use the console in "Come Home" or another Ren'Py game? (Windows, Linux, Mac) The tool you need is called unRen.
Official Windows version by Sam (admin of F95Zone):
https://f95zone.to/threads/unren-ba...compiler-console-developer-menu-enabler.3083/
Unofficial Mac & Linux version:
https://f95zone.to/threads/unren-for-macos-and-linux.16887/
Instructions:
1.) Copy the script file (e.g. UnRen.bat or UnRen-0.91.bat) to either the game's root directory (where the exe is) or the /game/ folder
2.) Double click on UnRen.bat to execute
3.) Select the option you require, for the in-game console select option 3) "Enable Console and Developer Menu" When you are playing the game, you can access the developer menu by pressing SHIFT+D. Chose the "Variable Viewer" to look at all the variables in the game.
If you know what you're doing, you can change variables with the console (SHIFT+O).
PLEASE KEEP IN MIND that changing variables without being 100% sure you know what you're doing
CAN BREAK YOUR SAVE OR THE CURRENT PLAYTHROUGH! Some game events may not trigger correctly. In that case your save game may not be fixable and you'll probably need to start a new playthrough. TO BE ON THE SAFE SIDE always save your game before changing variables.
So what you want to do once you have the console enabled:
Load your game
shift+o
type in: bro = u'whateverYouWantHerToCallYou'
enter
esc