I can add hireable versions of both, but the core was intended as a template for modders to follow as an example, not as a complete mod in itself. I could add a set of hireable Bakers if he's a popular model, but with all the hireable characters in the expansion pack, why would you want a baker hireling that cant bake yet? Harley could be hireable if you had a good relationship with bandits, but that's out of scope for this core, that will happen in mods made by other folks.
The guns are pure vanilla, so is the sounds. The NPC guns should be no louder than player guns.
I dont use a target health bar so I have no information on what you are seeing or not seeing. Example would help.
Harley Quinn is loud and obnoxious, the sound files are from a voice actor and not pitch adjusted. Like on the guns, feel free to turn your sound volume down, or remove her from spawning. That said, if I get multiple requests to lower her volume a few db, I can do that.