Choose Who Your Roommates Are with Choose Your Roommate Mod
Choose Your Roommate Mod is such a useful mod by one of my favorite modders, LittleMsSam (make sure to check out her other mods too)! It allows you to be able to CHOOSE your roommates. You do need Discovery University, in order to be able to use this mod! Discovery University brought back roommates, however; we aren't able to choose who our roommates will be, random sims that are "currently not in world" just show up in response to your roommate add or randomly generate sims.
You can now choose any sim in from any world (in your saved game), a friend, a romantic partner, a cute sim your saw passing by, but also a sim you made for the very purpose of the story you're telling!
P.S. Roommate options may be limited to homeless sims (sims currently not in world), if you are playing enrolled in University and living in on-campus dorm. Otherwise, options include all the sims in your saved game if you are living off-campus or just want a roommate and not enrolled in University at all.
Tips for Setting Up Roommates (Watch YouTube Video for More Info by following Timestamps):
How to choose a roommate: 5:38
How to designate room/apartment/house to your sim: 7:28
How to designate specific sim to a specific room/apartment/house: 7:55
Here is the link to download and read about Choose Your Roommate Mod:
How to download the Choose Your Roommate Mod (Written tutorial below YouTube Tutorial):
Step 1: GO TO WEBSITE
Step 2: Click on, I suggest the "SimFile Share."
P.S. Don't forget to update this mod every time there is a patch note for The Sims 4. You must redownload this mod every time and replace the previously downloaded files.
Step 3: Click "Download." Once download is complete,open in downloads folder.
Step 4: Unzip (using 7-Zip), by double clicking the folder (or extracting), and move contents of folder to your mods folder: Documents>Electronic Arts>Sims 4>Mods> "Choose Your Roommate" (Create this new folder)
WARNING: DO NOT MOVE THE FOLDER TO THE MODS FOLDER OR IT WILL NOT WORK! UNZIP FOLDER AND MOVE THE CONTENTS (files in the folder)!
Step 5: Start the game up!
WARNING: MAKE SURE YOUR MODS AND SCRIPT MODS ARE ON ENABLED IN YOUR GAME OPTIONS!
To learn more about downloading mods: CLICK HERE
To find more must have mods: CLICK HERE
To download the Choose Your Roommate Mod: CLICK HERE