First things first, download the custom character mod from Kyle the scientist https://modworkshop.net/mod/24802
INSTRUCTIONS

1. put the zipped folder in your mods folder and run the game once
2. this will create a new folder called CustomCharacterData in the enter the gungeon folder, download a character and unzip it
3. then take the folder in the folder out of the folder and put it into CustomCharacterData folder (thats a lot of folders)
4. Delete mods.txt if it is there
5. It should be done

Download __Mod The Gungeon __
download here! -> https://modthegungeon.eu/

__Loadout __

witch pistol:
potion of lead skin:
chicken flute:
backpack:

__Stats __

Health: 1,
Armor: 2,
Damage: 0.8,
Coolness: 3,
Shot Piercing: 2,

__Things To Note __

There are no punchout sprites (cultist doesn't have any. But there are punchout facecards)
The bosscard doesn't work (Cultist isn't meant for solo)
Foyercard does work, but the name doesn't (because cultist is meant for solo.) Also The foyercard might only work if the latest character you have downloaded or unlocked has the base of the Bullet.

have fun playing as him :)