Afterbirth Only! No asking for a rebirth version.

This mod is an extremely simple one. It replaces every Host and Walking Host with a Red Host and Walking Red Host, respectively.

There is an uncontrollable exception: Hosts from skulls. So just don't blow up any skulls while enemies are in the room and you'll never have to fight a host.

There is also a controllable exception: Meatballs.

Meatballs turn into Hosts upon death. However, as they do not have an alternate version, they are not replaced by this mod. (If you have a suggestion as to a replacement enemy that also fires fountains of bullets, go ahead and say it in the comments)

Apart from those, you shouldn't have trouble with Hosts with this mod installed. Yes, even in Greed Mode.