Thank you for the question!
I'm feeling really eager to write about this AU ;)
This is the explanation.
In the early stages of AVA 1, when Alan created Victim, he was engulfed in immense pressure that attacked him from all directions, as if he were being bombarded endlessly. This left him trapped in a suffocating state of overwhelming stress.
This intense mental strain ultimately triggered his transformation into Noogai.
At the time, he was 17 or 18 years old, and the stress from having to finish an art project for university on time must have weighed heavily on him.
After Victim fled, Alan simply wondered what had happened on his computer screen, but didn’t think much of it. He managed to submit the project on time and passed.
He didn’t even know that his stickman character was truly alive and capable of moving.
All he remembered was that he was just working on an animation.
In AVA 2, Alan created another stickman character. It seems he changed the name quite a few times (he wasn’t very good at naming characters). He eventually decided on the name "The Chosen One." After naming it, he was shocked to see that TCO could move on its own, and even more shocked when TCO suddenly attacked him.
In AVA 3, he didn’t know how to fix all of this because he couldn’t contact Programmer021 anymore, as AIM had been destroyed earlier during TCO's rampage. So, he decided to contact DJ.
As for The Dark Lord, I think Noogai must have been the one who created him.
But by the time DJ arrived, it was already too late. Both TCO and TDL had escaped from Alan’s computer and left behind a blue screen of death.
For DJ, it must have been strange to see Alan sitting still, staring at the blue screen of death with a blank expression.
DJ probably asked Alan what had happened. Alan would have looked confused and asked, "What do you mean?" before turning to see the blue screen of death on the computer and shouting, "What happened to my computer?!" Something like that.
@wingedsublimeland I think if I reply to the comment under the post, it will be too long, so I decided to post a new reply instead.