Shambler
The most common and abundant. They move at a slow pace, and have no specialties other than biting and grabbing you. Shamblers alone are very weak, but when there are multiple of them, they can become a problem. When shamblers grab you, you get locked in an animation where you are trying to escape it's grab, but if you wait long enough you'll be freed. If another shambler grabs you while in this animation, you enter a new animation where you're being bitten, and you must have someone save you in order to be freed. If 4 shamblers grab you at once, you will die instantly, emitting a scream as you get eaten. Every 3rd grab by the same shambler will cause them to put you in the biting animation, so do not let them grab you multiple times.
Runner
Runners are a common, fast, nimble, and dangerous zombie type that can easily kill people who are alone and/or not paying attention. They are loud, emitting growls, and have red glowing eyes. By themselves, they are pretty weak, as one slash with any weapon can neutralize them, but when there are multiple of them surrounding you, they can be lethal.
Runners enter a state where they duck their head, which means they are trying to attack you. Upon contact, the runner will push you onto the ground, biting you to your death. Multiple runners (up to 3) can bite you at once.
you CANNOT escape by yourself, and you must have a teammate get rid of the runner(s) on you. Runners can kill you faster depending on how much health you have and how much runners are on you
Bomber
Bombers are a less common zombie type. They are a slow, loud zombie holding a barrel of gunpowder and a torch. When "attacking", the bomber lights a fuse with the torch and holds up the barrel, slowing down their speed a little bit before the barrel explodes. This explosion is powerful enough to destroy all sapper buildings, other zombies around the bomber, and your teammates. Bombers can also prematurely detonate upon contact with any source of damage (guns, environmental fires, grenades, etc.)
Zapper
The zapper, (short for zombie-sapper) a rare, slow zombie that can pack a punch. They wield a sapper's axe, along with a sapper's clothes, and they have orange eyes. When in close proximity of a zapper, they will bring their axe above their head and swing at you, making the zapper pause for a second upon contact with the ground. When hit by their axe, you lose around 75% of your health (without a damage resistance buff), and you gain a debuff called "Gashed".
This debuff makes you more susceptible to infection, and the debuff can only be removed via surgeon's medical supplies.
Igniter
A rarer zombie type that is weak in endurance, but can hurt multiple people at once with it's molotov. It appears as a charred,burnt up shambler holding a molotov emanating a bright yellow glow. The water bucket utility is a direct counter to the igniter.
Igniters, upon seeing a player, it can throw it's molotov, covering a large area with fire. This fire can slowly destroy sapper buildings. When a player touches the fire, they get put in an animation where they pat off their body to remove any flames. This animation makes you vulnerable as you cannot attack during this animation. When you stay in the fire for too long, you get put in an animation where you are on fire, screaming, and unable to move, requiring a teammate to stomp out the fire or splash water on you with a water bucket. You also get a debuff called "Third Degree Burns", where you cannot heal above 50% health for a certain amount of time.
Cuirassier
The rarest zombie type. A zombie with high endurance to most weapons, and can deal devastating damage. The cuirassier appears as a heavy cavalry soldier with metal armor called a cuirass, and a heavy sabre. This zombie has 2 modes; Dueling mode & Charging mode.
Dueling mode: In close proximity, cuirassiers will start giving chase, trying to stab/slash you when close, while dodging or blocking your attacks. Due to it's armor, most of the time your gun's bullets/sword's attacks will reflect off.
Charging mode: Upon seeing a player from far away or being in the duel mode for too long and backing up. They will roar out loud, raising their sabres, and sprinting at inhuman speeds (faster than a runner) with their sabres out in front of them.
When a player comes in contact with the sabre during this, they will be impaled, entering a state where they can only crawl and must have a surgeon come heal them.
Any armor can stop the cuirassier, charge from impaling you, but it will knock you over and stun you for a bit.