This is my L4D2 Crossover collection. Everything here has been based on my L4D2 crossover ideas. Often or not, the ideas are originally from mods I enjoy, so they can quickly change, but because there is only one more commission left, the lore is quickly close to being done.

Lore-wise, the infection is not rabies, it's a modified version of another disease within the Robo Army(this lore is insane, so all I will say is that it is from Robo Faust if anyone knows Guilty Gear) that is like the L4D2 infection, but with magic and all that Guilty Gear crap. It is modified to the point people can turn into "Vampires," which explains the red eyes in the infected's design, and the name "Red Eyes" for the infection. (It is described as an eye infection to reduce fear)
Unlike normal infected, like vampires, blood is the main resource for living. The blonde part/gray hair is pretty much because the infection is heavily based on another character, turning people into said character. (Read the note below)

The Houseki part however is, of course, a modified version of the whole vampire part. Based on the Houseki Gems, it turns people's skin and flesh into gems before the whole vampire part takes hold. This means if someone looks like Cinnabar, that is just some random person having Cinnabar flesh. Phos is the only one that is not infected since their Phosphophyllite skin is too weak to fully infect, which explains the carrier part. (That also explains the Louis part)

On why Signalis characters are here, there's some universe-hopping crap to explain it, but in short, it is why the infection got to this world in the first place. (Again, this is connected to this "Robo Army" stuff, so I will not give the insane part of the lore, which will also explain why Robert/Robo Ky is here too)

(NOTE: The red-eyes are based on Red Arcueid, a vampire in the Melty Blood/Tsukihime series, which is now added to L4D2. The blonde hair/gray hair is based on Arcueid and Neco Arc Chaos.)
(Read the bottom for the Tank mod that also has her. Here's Red Arcueid alone tho: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3158323420 )

Others like the TF2/RWBY thing are now heavily or lightly connected:

Guilty Gear Swamp Infected: The original infected that Robo Faust made. They have greener skins and are more like zombies. Those would be the prototype of the "Red Eyes" infected.

TF2-Based Stuff: The crossover occurs in the world in which TF2 is a major part of history. Events did happen based on the story, and ultimately, people can take drugs to become one of the nine mercs. Bill is one of those people because he was in the army before. The TF2 undead commons are already a major event within the world, and while there are now fewer outbreaks, the new infection is only making it worse again.

Yakuza: A Japanese mafia group decided to grow in power, and moved some of their members to America. Nick(Kazuma Kiryu's English undercover name) is one of those members. Not many mods here are going to be related to it.

RWBY: A female biker gang is starting to grow in the US. There are 4 groups within the gang, and Francis(Weiss' gang name) is part of the "White Lotus" group.

Persona: Aigis(going under Zoey to keep her identity hidden), is a machine designed by both the TF2 world and the Nation to investigate the Red Eye infection. The pipe bombs are pretty much designed by the same company that made Aigis, think of it as old prototype parts reused as weapons. Aigis also has a life outside of her job to try to blend in with the people(Which explains the movie-watching part), though, this is also because she is based on another person. Read More here: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3226221124

Family Guy: Coach(Peter) is a buff normal family person, who was a coach in a school. He later met a few others during the escape. (The "Glenn Quagmire" common infected are just some insane infected wearing a Quagmire bodysuit.)

Silent Hill 3: Heather Mason is going to be the artist/designer of the series. This is mostly because a lot of the art styles I made for my commissions are based on HeatherChasesYou, the artist that I enjoy using their style for this crossover. For this, the Heather mod is mostly just a "self-insert" story for her. (There is some insane 4th wall story about this crossover being a game in another universe, and Heather is a giant fan of it.)

Weapons/Others: Signalis' weapons are from, of course, the world of Signalis. In the story, those weapons were made with a small amount of money, which explains how they are more available worldwide. TF2 weapons are self-explainable: They are from the TF2-based world. Futuristic/other weapons are from both worlds working together to create better weapons or just weapons we know of IRL.

Special Infected:

Faust - Someone who was turned into him due to experimentation in the Robo Army.

Blake(RWBY), Ryuko(Kill La Kill), EVA(Ōban Star-Racers), Yumi, and Kuro (Bombergirl) - Part of the Black Lily group in the infamous female biker gang. Before turning, they were already very dangerous for carrying out blackmailing and possible group hunts against rival gangs.

KLBR - An experiment on the "Red-Eye" disease. Versions tell you how old they are. Bigger head means older. The Corrupted are the first-ever version, sent to infect others.

Cinnabar - Someone with Cinnabar skin who was experimented to produce Mercury.

Neco Arc - Some infected turned fully into Neco Arcs other than a few that are just Neco Arcueid(Clowns). However, they are more dubious and insane than a real Neco Arc.
OLD: ARAR - Modified from its corrupted version, this Replika now hunts survivors to take into danger.

Demopan - A rando that because TF2 was history in that world, has chosen to change to become a Demoman(people can take drugs to change themselves into one of the nine mercs). Treat the world ending as a giant TF2 match. (Originally going to be an infected Riesbyfe Stridberg from Melty Blood, but there's no model for her that I can get, and because I already have Neco Arc for the reference to Melty Blood.)

Witches - Not directly infected by anyone/anything. Mostly some bioresonance/Signalis stuff that causes them to be infected. A white-haired woman was said to be behind that.

Tanks - Experiments made by the Robo Army.(Other than Red Arcueid, she is the reason the "Red Eyes" disease was made.) All are explained here, and you can now have them ingame: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3146820359

Everything I plan to commission for my Crossover:
ALL DONE!!!