Pth mentioned that I should move this idea over onto a more appropriate forum, and I’ve talked about this previously in the Draw Your Cataclysms thread, so I’ve got some concept art and a basic idea of how this would work!

The basic idea for this is that this would be either a negative trait that you could pick for your character in any scenario, or it’d be an “Any Class” scenario.
Whatever way of it, it works like this: Along with your standard fare of zombies, you’d have one Zombie Nemesis. You could give this zombie a custom name and phrases by modding the files to make it fit with your character’s story, or you could go with a standard zombie who just seems to want you dead - in the case of the image above I’d name my zombie nemesis Coulter, and he’d occasionally utter phrases relating to the failure of the Skybreaker Project, blaming Chaz for the Cataclysm.
The Zombie Nemesis is a fearsome type - possibly a Brute, possibly just a standard zombie that’s a bit tougher and faster and generally more dangerous, the idea is that they’re a terrifying presence to your character, and you’ll get a hit to your morale if they’re nearby. They can be killed just like any other zombie, and pulping them will give you a little morale boost (“Took out some frustration on [Nemesis]” perhaps), but even pulping them won’t stop them from getting up - if possible, they’d flee some time after recovering from being killed/pulped, and skulk somewhere nearby for their next ambush, or otherwise approach the player again after a few days.
If the player attempts to butcher or enslave their nemesis, much like in a horror movie the nemesis will leap up from their position and attack the player before fleeing, resulting in a potentially nasty wound and a decent hit to morale (“Was jumped by [Nemesis]”, possibly!).
I’m not 100% sure how this might work out, but I sorta like the idea of having it be an option for players who want to have a little bit of a slasher movie style bent to their zombie apocalypse survival.