EDIT:
On another note, this game crashes every half a day. No additional modding on my part.
I managed to find the fix for the crashes.
In case your game randomly crashes (after applying patches to fix the FPS), don't start messing around with the settings trying to find what it is. It's the modded characters themselves. I tested them on my own, and after replacing them with the vanilla characters, the game worked without any crashes 5 days straight.
In the main folder, go to data > save > female for female characters and data > save > male for male characters.
In the folder, you will see a bunch of character images, as well as a folder named "Illusion Default" on both folders. The images within the main folder are the modded translated characters, while the "Illusion Default" folder, contains, obviously, the default/vanilla characters.
I recommend you make another folder in the main folder and put all your modded characters in it, and copy and paste the Illusion Default characters on both male and female folders outside of them.
Custom characters that YOU create most likely won't have any problems.
Just a bit of a warning, the default/vanilla characters
DO NOT have English names. If you need them to have English Names, it's best to edit them in the Maker and add a name using a random name generator or just look at the modded character's image and put their name into the vanilla character.
Other than the names, the characters work perfectly without any problems.