The Veteran Bullet Kin is my very first custom character.
You will need the CustomCharactersMod by Kyle for this to work. https://modworkshop.net/mod/24802
The Veteran Kin's Items:
Regular Shotgun (infinite ammo) Live Ammo (why not) Silver Bullets
Thanks to @Sadgrub for telling me how to fix the buggy sprites!
If there's anything wrong with the character, please tell me in the comments.