⇦ Here's one that I found online. I take no credit for it.
1. Download a custom head or make your own using photoshop or pixlr editor or gimp. (The file must have a transparent backround, must be .png, and must be 128x128 pixels.)
2. Go to C:\Program Files\Steam\SteamApps\common\BattleBlock Theater\GameData\UserFaces
3. Drag your head into there
4. Relaunch or restart Battleblock Theater
5. Make sure you have "Remote user faces" enabled in settings.
6. Go to the the head catagory and look for the one that looks like a blue print and change into your head!

⇦ Here's one that I found online. I take no credit for it.
1. Download a custom head or make your own using photoshop or pixlr editor or gimp. (The file must have a transparent backround, must be .png, and must be 128x128 pixels.)
2. Go to your finder, go up to the tabs (where you'll find File, Edit, View, Go, etc.) and select Go. Hold down alt. The Library should appear, click that then go to Application Support, then go to Battleblock Theater.
3. Drag your head into there
4. Relaunch or restart Battleblock Theater
5. Make sure you have "Remote user faces" enabled in settings.
6. Go to the the head catagory and look for the one that looks like a blue print and change into your head!

Thank you all for reading my guide. If you want, why not check out some of my other ones? How about this one on how to maximize your expierence in Battleblock Theater:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=470674236
I also have an arena playlist that you might want to check out, Puzzle Ball!
Here's some Gameplay:
Here's the Playlist:
http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=465197145