Modding

Since Yandere Siumlator is made in Unity, It can be modded. There are various types of modding, The most popular being the .JSON file editing. Page made by SenpaiX.

JSON modding
Most popular and easiest type of modding ; Check the Mods page. Most (or all) mods are made by this method.

Tutorial
To mod the game using this method, You just need to follow these steps.
 * 1) Open the YandereSimXXX_Data folder in the game's destination.
 * 2) Open the folder StreamingAssets.
 * 3) Open the folder JSON.
 * 4) Right-click the file "Students.json" and select "Open with..."
 * 5) Select notepad.
 * 6) Congrats, That's all what you need to do. Female hairstyles are by names like Drills, Twintails, Pigtails,etc while Male ones are by numbers.

Texture Modding
This method is used by those who want to make custom hair colors, uniforms or such. You'll need the Unity Asset Editor program in order to mod the game in this way.

Tutorial

 * 1) Open UnityAE.
 * 2) Select file from the top list, then press open.
 * 3) Choose the file you want, mostly resources.assets and the sharedassetsX.assets  (Never bothered to try doing it so idk)
 * 4) You get the textures. Congrats.

XML/DLL editing
In the game files, in the folder Managed, There are many DLL folders with the most containing being Assembly-UnityScript.dll. I don't know how to mod it in this way, But YandereDEv seems to not like people modding the game other than editing the Students.json which may be a reson he added the Fun.txt girl to scare nosey people who get inside the game files and edit trying to mod it. It's unfair.

Tutorial
I don't know how, It'd be good if someone's gonna post a way. (Definitely not Jackboog21, he hates when people try to know how and want only himself to know.)