I’m thinking bastion because he can do hella damage. Mercy can Rez though!!!
Provided that she doesn’t went Zombie herself.
But for me, it has to be Reinhardt. High armor, powerful swing, hard to be overpowered by zombie hordes. I could just sit on his shoulder and let him cleave through the horde like it is nothing.
i would probably pick genji. Nothing sounds more like an anime then a ninja slashing through zombies.
But Genji will require a lot of healing. Are you up for the task?
lul
17 characterssss
Hmm…fair arguments are being made here, especially regarding Reinhardt, but hear me out here…
…McCree.
Bang, headshot. Bang, headshot. Bang, headshot.
McCree lacks in AoE damage and also has a reload.
He’d probably be good 1v1 but will eventually be overpowered when they come in hordes.
Well, that’s where Deadeye comes in.
And let’s not forget, gameplay wise, Deadeye allows more than 6 shots when hordes are involved. Just ask Junkenstein’s horde.
He could wipe a horde of a hundred in like 5 seconds.
Reaper because he can’t die and has an infinite supply of shotguns!
Torbjorn since can build a zombie mashing machine.
Just add turrets and some grinding machines and we’re safe.
…unless we get countered by letterboxes 
I’ll take Mercy to be at my side any day. This is because “Heroes never die” means “heroes can not become zombies.” If you don’t die you can’t be a zombie. It’s ELEMENTARY!
bastian is a great choice, he doesn’t even have brains to eat
But his bird does. And the bird is the brains of the outfit.
Birdbrain, if you will. 
oh crap, zombie bird, bastian flips out, mows us all down, gotta think, GOTTA THINK!!!
Maybe you should pick D.Va, she’ll feed the zombies chips and soda and they won’t want brains anymore.
I’d pick tracer, because if she gets bitten she can just recall, where as I can take care of myself, but could use the companion!
Bri or Rein for zombie.
Their armor protection is a zombie deterrent.
But Mei could just freeze them or place a wall in front of a zombie horde that is chasing us. Then Blizzard would kill most of them. Dropping them to less than absolute zero.
Boosting through a crowd of zombies, missles blazing would be awesome!
Not awesome for the zombies, probably. xD
world is dead, only thing that zombie games taught me - give up, it doesn’t worth it, nothing will be ever good.