You live in a frozen wasteland, barely any plants and animals live through the endless winter. Growing your own food is hard and animals don't have enough food to survive and reproduce. Plants would need to be grown in a glass dome, as the day and night cycle continues on. You would need thick clothing to survive the harsh cold, it makes getting bitten a bit hard. Though, certain zombies are able to rip through your clothes to bite and turn you into one of them, having a rare chance to turn into a Snowball Zombie. Unborn children can turn into half zombies if their mother gives birth after being bitten. Half kids have no intention to try and turn people, they like to fight other half kids, and they can survive the cold without needing to wear any thick clothes. Half kids can only live up to 15 or 16 and they turn fully into a zombie. The oldest half kid is 19 and he takes care of half kids in a slight isolated area.

Weeee!

Zombies-

Snowball Zombies- Big buff mutated zombies that will kill you with anything that involves snow or ice, whether it be a icicle or just a huge snowball. When you die, it will decapitate you and set your head on a snowman body. Seeing many randomly built snowmen (with the heads of people-) mean a Snowball Zombie is near or their den is nearby.

Regular zombies- Just dead mutated people, nothing special about them.

Half-kids or Half-zombies (called whichever)- Kids born with half of their specie being zombie. They can have cannibal instincts or can turn into a zombie when they hit the age of 15 or 16, never able to live a full life. They are immune to the cold and act like it is just summer so they wear shorts and t-shirts most of the time.