If you want to swap the daughter's character portraits or backgrounds, follow these general steps using pmr_dat_tools :
Unlike modern games with easy-to-use Steam Workshop support, modding often requires third-party tools found in community forums. Tool / Resource pmr_dat_tools Princess Maker 2 Refine Mod
Certain versions of the game have censored endings or items. Mods can restore these "controversial" endings, like the marriage with the father or butler, which were removed in newer editions like Regeneration . If you want to swap the daughter's character
Dedicated community patches aim to fix bugs and improve UI elements that weren't fully modernized. Popular Modding Tools and Resources Princess Maker 2 Refine Mod