Before the apocalypse Nick was an underpaid fast food worker in Britain, and he sometimes took on the mascot shift. Now, in the apocalypse, his mascot costume is the only thing between him and death.

Somehow zombies are so stupid that they can't recognize Nick is a human under there, so they just think he's one of them or a cat or something. Nick, the genius, has spent years in that costume absolutely terrified that the second he takes it off he'll be eaten alive. So he just follows zombie hoards and blends in hoping that they'll stop by a place he can find snacks. That's his life.

Because Nick is so dedicated to the zombie mask, none of his fellow survivors recognize him as human either. He's way too frightened to try and signal other survivors, and honestly it's a miracle that he's survived on his own. Everyone else started groups and established teams in the first month of the apocalypse, and most who didn't died, Nick has pretty much survived on dumb luck and fear.

Some people have caught him eating snacks or doing human things and realized like hey! That's a dude! And have helped him out and such. He's been given several places to sleep over the years, but he's never been able to stay anywhere long without putting other survivors at risk (y'know, the extra mouth to feed and all) so he's content enough keeping up the zombie mask for other people's sake.

Nick is utterly paranoid and isn't particularly good company. The absolute flip the apocalypse started for him wasn't one he ever shook. There is rarely a second of calm in Nick's life. He's incredibly twitchy, he trips on his words often, his mind is always racing, he never quite sits still or thinks straight.

Before the apocalypse Nick was living in some scuffed flat with his girlfriend, the two of them juggling a couple jobs to keep the place. It wasn't as bad as it sounds, they both had plans to make things better eventually, it was a temporary shitty state they had to sit through.

Eventually became never, the apocalypse hit. His girlfriend got dragged away by the piles of people all fighting each other to get away from the undead creatures emerging from the ground, he hasn't been able to find her since.

His girlfriend's whereabouts today are unknown. Her name was Emma.