You mean, they eat everyone else, but when the MC interacts with them, they try to sell the MC their wares? I assume the MC would create a kingdom. People would flock to him because he's able to reason with the zombies. He would become a king and daily go out and talk to the zombies while luring them into some kind of trap (maybe a big pit or something). Eventually, the people of the kingdom would become discontent, being safe from the zombie threat for so long, and they would lose faith in the fact that the MC is actually protecting them from anything. They would overthrow the MC king and he would probably die, starting the zombie apocalypse all over again.
That's what I think at least.
If that's an actual story idea I'd wanna read it
Maybe after he died, he would resurrect as the Zombie King and slaughter humanity for revenge.
Pokemon zombies would be terrifying!But which game NPC?
You made eye contact with the zombie. It screeches as it rushes towards you. Maybe it uses its power, because you can't move at all. Just as you thought you'll die, the zombie strike a pose and his speech become clear. "Hey you seem strong! Do you want to battle?" A zombified poliwag jumps out of his pokeball.
- Pokemon
But which game NPC?
You made eye contact with the zombie. It screeches as it rushes towards you. Maybe it uses its power, because you can't move at all. Just as you thought you'll die, the zombie strike a pose and his speech become clear. "Hey you seem strong! Do you want to battle?" A zombified poliwag jumps out of his pokeball.
- Pokemon
You wandered to a zombie town. You panicked and killed zombies to survive. Somehow there's police zombies chasing you. You killed them. Somehow, in a world where working fuel and transportation is scarce, there are helicopters and dispatch chasing you, and they're all zombie
- GTA-ish (i've never played this game)
You arrived at a village and the zombies give you a house. You give the zombie a rock you just picked up. The zombie is happy. You decided to become a farmer, hopefully the animals amd plants won't mutate.
- Harvest moon