This is just an idea for a possible new chapter. Nothing you're going to read is official. The skills and perks that you are going to read have data that can be modified, I have only given them some modifiable values.
Remember that you can contribute your opinion and give ideas in the comments, which I will appreciate.
You may notice writing errors. This is because my English is not good and I must use a translator to write this.

Enjoy and do not forget to leave your opinion in the comments.

NEW KILLER: THE ZOMBIE

Background:

When the abuser Rogan Maxwell saw the corpse of the woman he had loved and murdered come back to life, he completely lost the notion of sanity.
The apocalypse had begun and hordes of the dead were rising in the streets eager to devour human flesh. As a good coward he was, Rogan left behind many people who needed his help and also killed many others that he considered "hindrances." His selfishness even led him to use a child as bait to escape.
After several years of apocalypse, surviving as he could, he managed to reach a community where they welcomed him with pleasure, because nobody from there knew his past. And he made sure that it was so.
In the community he met a beautiful woman of whom he became obsessed. It reminded him so much of his wife and his appetite increased. I wanted that woman. The woman was accompanied by a child. A child who was incredibly familiar.
He tried to conquer the woman as he could, but she was hard and, perhaps, saw through him. It was rejected again and again.
One night he felt enlightenment when he remembered who the child was. It was the same child he used as bait at the beginning of everything. He felt that he should get rid of him, because he could get out of his tongue if he had not already done so.
One day, when a horde of the dead surrounded his group inside a factory, his selfishness returned to him. In the group was the woman and the child, but he fell by accident in a room surrounded by dead people when the floor he was on gave way and made him fall. The woman jumped to her rescue, trusting that Rogan would help them climb again. But it did not happen. Rogan abandoned them to her fate with a smile on her face, thinking that she had got rid of the problem. However, in a moment of low guard, a dead man came out of the shadows and bit Rogan's neck hard.
The fever increased and, after several hours of suffering, Rogan came back as one of those things. An unconscious and eager to eat human flesh. He came back to the room where he had left the woman and child abandoned and joined the horde that tried to break down the door. With force, the horde managed to enter the room and, what had once been Rogan, saw the woman sitting in the room with a gun in her hand. He was about to grab her, but before that happened, a dense fog filled his dead eyes. She was in the same factory, although the woman had disappeared.
However, something had changed. There was a hint of awareness inside him. But his eagerness to eat meat was still there. However, a voice from the underworld gave him other instructions and skills that would help him fulfill them. That being had felt the evil inside that rotten shell.

POWER: UNDEAD:

Dead in life, live in death. That will be his eternal punishment.
· While you are not in pursuit, your speed is 3.8m/s and your terror radius is 0.
· When you are in a chase, your speed increases to 4.4m / s and your terror radio is 32 meters.

When charging while holding down the power button, you will ambush, moving at a higher speed (6.4m/s) for a few seconds (2 seconds). If during the dash you reach a survivor, you will grab him and bite him, causing him the effect of Infection. Infected survivors:
· They will have a bar under their icon that will slowly empty (in 5 minutes). When the bar reaches 0 the survivor will die instantly.
· The bodies of the survivors killed by infection will resurrect like zombies after 30 seconds, staying wandering in the place where they died without leaving a radius of 6 meters. If a survivor passes by and they see him, they will rush for him and can bite him if they reach him. If they bite him, they will apply the Infection effect and reveal his position to the killer for 4 seconds.
· If you bite or a resurrected survivor bites a survivor who is already infected it will reduce the bar in 10 seconds.
· Infected survivors suffer a 2% penalty on their speed and actions such as repairing, curing, sabotaging, purifying, saving or jumping, and their breathing becomes more audible. Nor can they be cured while infected. Every 30 seconds, the penalty will increase by 2%.

Survivors can eliminate the effect of infection if they inject an antidote or escape:
· When repairing an engine, it will release an antidote that can be picked up by any survivor regardless of whether it is infected or not. There is also a 10% chance of getting an antidote when registering a chest.
· Infected survivors who have an antidote can use it whenever they want. Uninfected survivors who have an antidote can inject it into any infected partner.
· If a survivor who has an antidote is hung on a hook, the antidote will be broken and can not be recovered.

PERKS:

-Dead Ear: A slight noise can upset you. The sound of the steps of the survivors, as well as the noise they make when hiding in lockers, increases by 25/50/75%. Reduce by 5/10/15% the volume of the music during the persecutions, allowing you to better listen to the survivor you are after.
-Dead Walker: An energy overflows in you when you transport a survivor to the hook. While carrying a survivor on your shoulders you can pass over windows. Going through a window reduces in 3/2/1 second the time necessary for the survivor to escape.
-Rotten Meat: Your insensitivity makes it harder to stop you. You have a 30/40/50% chance of avoiding being stunned when you are hit with a pallet or with a survivor perk.

NEW SURVIVOR: SANDRA GARCÍA

BACKGROUND:

Her vocation as a teacher of mathematics would end the day the dead decided to get up.
Leaving everything behind, he left home hoping to survive.
After a few months of hard survival in which he had to do great hardships to stay alive, his fate would change when he rescued a child from being devoured by dead people. Sandra taught you everything you need to survive: work as a team, shoot, flee and escape and, most importantly, teach her that when everything is lost, you have to make sure that, if you are going to leave, be as painless as possible.
His life changed when they both joined a community that promised a prosperous future.
His life would change again when, after a while, the community joined a man who gave off bad vibrations. Sandra tried to ignore those negative thoughts, but soon she would realize that she was wrong.
In an incursion to a factory to look for supplies, she and her group were surrounded by the dead. After being abandoned by that horrible man when she tried to save the child, she realized that there was no hope for her after observing that the only way to escape was through a ventilation duct in which the child could fit, but she do not.
After saying goodbye to him, she sat in the room while listening to the dead trying to enter. There was only one bullet left. I knew what I had to do. If he left, it should be with as little pain as possible.
When the dead entered, he saw that the one in front was the same man who left her. He had received his punishment, but his sin would also end with it.
Before he reached it, and with tears streaming from his eyes, he stuck the barrel of the gun into his mouth, closed his eyes and pulled the trigger.
Without knowing why and without remembering anything, she saw herself again in that factory. The dead were gone and she felt alive. When he went out to investigate, he felt an evil presence in the environment, worse than the dead.

PERKS:

-Parabola: To survive the dead, you must know how to avoid them. It increases slightly / moderately / considerably the speed and the turning radius you have when turning. (It's a perk to improve the performance of 360).
-Kicker: When they grab you, you should get out fast before they bite you. Once per game, if the killer grabs you while you repair, jump through a window or pallet or open a closet, you will give a strong kick that will stun for 2/3/4 seconds.
-Save The Last For You: When everything is lost, you must make sure you leave without pain. But when death is not an escape, you must avail yourself of one last chance to escape. When you are the last survivor alive, you can shoot with your pistol only once. Press the skill button to holster your gun and aim, and left click to shoot. If you manage to hit the killer, it will fall to the ground and remain stunned for 10/15/20 seconds. If the shot is in the head, 5 more seconds will be added.

And here the chapter. Please, leave your opinion in the comment box because it would help me a lot.