Here's a character concept:
Boys
Appearance: Boys is a two headed hominid who wears overalls. Boy 1 is the left head and Boy 2 is the right head. They have elongated heads and necks and Boy 2 has plutonium barf left on his mouth.
Passive: Boy 1 has 6 health, while Boy 2 has 4. Boys has 3 weapon slots; Boy 1 has 2, Boy 2 has 1. You begin playing as Boy 1 with the pistol, when Boy 1 dies you play as Boy 2. While playing as Boy 2, you have no weapons to start. You do not permanently lose the weapons Boy 1 was using, but you cannot use them as Boy 2. You also cannot use Boy 2's weapon while playing as Boy 1. You get to play as Boy 1 again in the next level at 1 health. When Boy 2 dies, you're dead. In the next level, Boy 2 loses his weapon permanently.
Active: Boy 2 uses rads to barf out ammo and health. Boy 2 can barf while playing as either of the Boys. When you play as Boy 2 however, he has the chance to barf out low to medium tier weapons.
Throne Butt: Both characters can freely select one of the three weapons they have collected , and Boy 2's weapon doesn't disappear after a level.
Stomach Ache- Ultra A: No rad consumption for barfing, but there is a cool down for it.
Professional Puker- Ultra B: Boy 2 barfs high tier weapons, more ammo, and more health for the same rad amount.
Full Stomach- Ultra C: Boy 2 throws up two weapons along with regular drops every time you barf for 150% the rads.
Projectile Vomit- Ultra D: Boy 2 throws up projectiles along with regular drops for 200% the rads. This means you could possibly barf out an SPC shot, or you could just fire a revolver shot.
I'm not sure if this character would be overpowered or underpowered, but feel free to tweek Boys and their stats to your liking. You are the developer, after all!
Thanks for taking the time to read my suggestion! I love your mod and each new addition makes it feel better and better!