Also, Roxy pointed out, and told you, there are no NPC cats. Wolves, foxes, whatever as well. A person plays all characters. There is never a character that won't have a living being writing for them. NPCs are characters not controlled by a living person. That only for video games. If you want to make characters that people can take and write for, then that's fine. But they're not NPCs. They're more like adopts that people can "adopt" from you, or that you let other people borrow to write for during the Roleplay.