So last night I sat down for a good 3 hours and cultivated different zombie classes for this Scarlet virus here they are below I hope you like some of them and if you have interesting zombie ideas you can comment below and maybe I'll take inspiration (while there might be the inspiration behind this I'll probably do some alterations my own to give it a unique aspect) from one of them if you're okay with it.

{Sprinters:} These types of zombies are known for their relentless efforts to kill their prey. Their speed is twice as fast as a human: they would rather kill than eat their kill if there's another living being around. Killing these guys isn't easy, but climbing up trees and zigzagging will slow it down enough for you to get a kill in or getaway while you can. Another thing that makes these things so deadly is the fact that they're able to see at night and have their eyes glow an eerie scarlet red.

There are two types of Sprinters:

Adult sprinters and Child sprinters. A child sprinter is very rare, they're still fast, but a little slower than an adult human. Their grip is still strong, but with enough force, you can get out of their grasp. Their stamina lasts longer than an adult sprinter and can chase someone down for a good 30 minutes before slowing for a short moment. 

Adult sprinters are far more deadly since they can run as fast if not faster than adult humans. Their grip is extremely strong and you would either have to cut off its am, or your own. Now the stamina of an adult Sprinter isn't nearly as long as a child Sprinter the adult would only go for about 10 to 15 minutes before slowing down.

{Walkers:} These guys are your more typical slow shuffle slight jog zombies. They're pretty easy to outrun and aren't too much of a threat if you know what you're doing. They can be trapped in fences and shrubs through will eventually find a way around it and will try tracking the scent for a while unless something new distracts it along the way. Their eyes have the scarlet red tint to them but they don't glow during the night. So these zombies are capable of feeling broken limbs though won't heal correctly so walking or other movements might become staggered.

{Crawlers:} These zombies are unable to use their legs. Either they have been broken so many times that it doesn't even matter if they healed they just won't work. Of course, there is the possibility they didn't have any legs to begin with, or the human beforehand was paralyzed waist down. Also, Crawlers come into two different types, some that are smaller are faster and can even lunge after someone if close by. One's that might be heaver are slower and easily seen during the day, but at night their silence can be deadly for those walking out at night. 

{Spitters:} These types of zombies tend to be more docile than their other breeds. These types of zombies tend to be the ones that have a large body mass. What makes these guys so extremely rare is the fact that they will projectile blood and stomach acid that's a little bit more concentrated. They prefer eating rather than hunting and will tend to eat its prey even if other survivors are running about. They like to form a pact with other Spitters and will attack if their food is being taken. Often times you will see three spitters in one pack.

{Night~Hunters:} These zombies are extremely dangerous at night as it's the only time they come out from their underground rat holes. Not only can they see in the dark which gives their scarlet eyes an irry glow, but are efficient hunters capable of tracking through smell and sound as well. Though their biggest weakness is bright lights and extremely loud sounds because they were turned at some point in darkness their eyes were able to enhance to the point they were able to see in the dark as clear as day. 

Some whose throats remain intact can give off a banshee scream that can alert other zombies or Night~Hunters who can hear from miles away. These hunters typically hunt in two pairs though ones that aren't able to scream will move further away from the screamer to protect their hearing. Bright lights will blind them for several minutes and loud sounds can impair them for a few moments. 

Going into their rat holes is a suicide mission since they know it like the back of their hand whether they become blinded or deafened. What also makes these zombies different from the others is the fact that they are the only type to sleep during the day when the sun is out. They can track their prey for over two days and can congregate in a pack of 6 though can grow in large cities. They don't get along with other zombie types and even if they do sleep during the day in their rat holes, they can easily awaken by the slightest of sounds. It's also easy to pick out a Night~Hunter by their pale ashen skin tone from the time being underground and away from any sunlight. 

{Scarlet Human:} Who would have thought that someone could live intact with the scarlet virus and not turn into a human bloodthirsty killing machine. Well, it can happen and it's like walking a slow agonizing death in Hell. Their intelligence, speed, strength, agility, stamina, etc increased but to the point that their blood always feels like it was on fire and their muscles on jabbing pins and needles. The only way to relieve this pain is to eat a fresh kill of some kind. They are also prone to hallucinations of themselves fully out of control whether it's a first or third-person experience. They'll also be plagued with their friends or loved ones eating them or being bloody. Taking just one taste of flesh or human blood will cause the Scarlet human to turn into a full-on zombie with thinking capabilities. They also have the capabilities to understand bits and pieces of words from zombies and zombies normally leave a Scarlet human alone. Might get into a fight if the Scarlet human makes too much noise, but not to the point of killing them. 

If one does fall for human flesh they will become a Fallen Scarlet Human where they will become twisted and arm themselves with weapons, body armor, and helmets, and will raid settlements. Some will even enslave and slowly eat away at the human or future flesh market.