"Mod" guide for the newest version
Since there seems to be plenty of confusion going on:
As of this version, there aren't multiple characters in the base game anymore. To regain the characters you need to download those other assets as a mod.
Usually you can access other characters by moving your mouse to the bottom right of the screen until a menu pops up. On the top of that menu you can select the characters. Without the mod however there is only 2 characters (one being the male character) available.
How to get the mod
Thanks to this post by SpecLurker:
I'm getting paid tomorrow so I decided I didn't want to wait
You must be registered to see the links
the characters are mods which I'm downloading at the moment so wait for that.
EDIT: Here we go
Mods:
PIXELDRAIN
You can download the mods as well. If you are having issues with pixeldrain you can either use JDownloader to download from pixeldrain regardless, or use this post by breathe to get a mega version that includes the mod (I did not check that download, so proceed at your own discretion).
Here's a Mega download link with all the mods (characters) already included. (v.0.42 PRO)
How to mod it
If you downloaded the included version you don't need to "install" the mod, if you did not, extract the folder and make sure the "Mods" folder is moved to the
TOP LEVEL directory of the game. The folder should be in the same folder that the bin.exe is.
That's it, start the game as usual, move mouse to bottom right to open menu, profit. You should have the modded characters available now. Enjoy.