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If you can that would be wonderful

That would be powerful in writing

Stories are more or less about character arcs. A character start one way and changes as the story goes on, whether for better or for worse. That’s another reason why flawed characters are better than flawless ones – as the story goes on, said characters can learn to become better people and fix some of their flaws.
You don’t have to limit yourself with just that though. You could also write about characters that become progresivly worse as the story goes. That’s technically what stories like Jeff The Killer are about.

It’s important to know however, how to do the character development right. Let’s look at the aforementioned Jeff The Killer. In it, Jeff starts out pretty normal, but just after a couple of fights with a bully, in one of which he gets his face burned and bleached, he goes completely psychotic. Now, I’m not saying this wouldn’t be a somewhat scarring event, but it’s not THAT scarring. Jeff The Killer is a pretty over-exaggerated story, and that’s why it’s not taken very seriously by some people.
Now let’s look at a similar story from the Batman comic “The Killing Joke”, which reveals the backstory of the Joker. In it, the Joker was once a factory worker who quit his job in order to pursue a comedian career. He didn’t do too well however, so he had to live in poverty with his loving pregnant wife. One day, I’m an act of desperation, he agreed to help out 2 criminals who wanted to break into the factory he once worked in. The day before the robbery, however, the Joker was informed that his wife had died because of an unlikely accident. He couldn’t back out of the deal, however, so that night he was forced to go with the criminals. Suddenly, the police and Batman showed up and quickly dispached the criminals (and even killed them,if I remember correctly). The Joker, In fear for his life, jumped into a vat of chemicals and barely made it out of the factory. It was when he saw his disfigured face that he finally snapped and went insane.

Now, while not perfect, this is a much better paced story than Jeff The Killer. The Joker doesn’t just get into a couple of fights, he has his already miserable life completely ruined. It makes much more sence for him to snap, because the story actually gave good reasons for that to happen. That’s why “The Killing Joke” is consideredto be one of the best comicbooks ever.

So when writing stories, make sure the events of the story gives an appropriate impact on the characters. For example, don’t have a character stop being selfish because he was told so by his girlfriend or whatever. Have him stop being selfish because he got to experience first hand the generosity of people in much worse conditions than him that have no reason to help him. Don’t be like Jeff The Killer, be like the Killing Joke.

Some more technical tips:
When making a multi-part story, try making each part have a beginning, middle and end like a normal story would. Otherwise you’ll probably and up writing parts that just show the characters go from point A to point B without anything interesting happening, and parts where there’s a sudden plot-dump and a ton of stuff happens to quickly and without warning.
Basically, treat each part as its own separate story.
When writing dialogue, try doing it like this:

Mr Example suddenly popped out of nowhere.
-Hello there! -he said, waving his hand- How are you doing?

Go on a new paragraph when another character starts talking. Keep the quotation marks for showing what a character is thinking:

“Wait, who am I even talking to?” Mr Example thought, shaking slightly from embarrassment.

Avoid doing multi-part stories if you don’t have a good reason to do so, since the pacing can get pretty bad if the readers have to wait a few days for each new chapter.

Be original. If you think about it, most creepypastas are pretty similar to each other. There are 3 types of stories most people write:Jeff The Killer-style stories, where the main character becomes a psychopath, Sonic.EXE/Ben Drowned-style stories where the main character comes across some inanimate object that is possesed and acts unnaturally (and usually kills said character) and the Spooky Monster-type that has the main character encounter some spooky monster that may or may not kill him by the end.
Don’t limit yourself to just that! Think of new and weird ideas and don’t be afraid to experiment. There are many ways to do horror.
Ask yourself this: What do you want people to feel when reading your stories? Scared? Terrified? Creeped out? Disgusted? Insignificant in the presence of a much, MUCH greater and more powerful force than them? Combinations of the previous choices?
You could do all that. Jeff the Killer already exists, so there’s no point in re-writing it, right? So instead of doing that, go for something unique.

Of course, that doesn’t mean you should completely avoid using some cliches. Thinking of something completely original is near impossible in this day and age, so don’t worry when getting some inspiration from pre-existing stories. Just don’t forget to add your own personal touch, your own idea, your own unique interpretation that would give a new meaning to the old story.

Also, grammar is important and stuff…