The location is Los Angeles California AND or whatever city you want I don't really care and your characters can be real life people or fictional people like Kirk or batman.
here's a template you should follow
To make things a bit more challenging/fair here's a small set of optional rules:
1. Try to form a team without overpowered characters like Goku who can wipe out zombies easily.
2. Give your team a run for it's money try making a team that would stuggle or have a challenge in this apocalypse
Here's an example of a random team: