Posting my Bendy theory here:
I was quite literally in the shower when I figured this out, How the INK works, THE INK DEMON, JOEY DREW. How this all connects and man, I feel like Matt Patt or some one else might have already theorized this but screw it.
I think the entire Lore of the game is spelled out in CHAPTER 3 of BATIM in the devil path in the recording JOEY left behind. Joey explains in the tape his thoughts on DREAMS and BELIEF and how with enough Belief you can even cheat death itself. I believe (pun not intended) that the ink itself MIRRORs Joeys ideals.You cant die in the cycle, mirror joeys ideals of cheating death. So what's stopping the ink from mirroring the other ideals of Joey. My evidence? SUSIE CAMBEL and THE INK DEMON.
In BATDR Henry tells us that the ink demon can control the cycle but he must obey its laws THOSE LAWS BEING BELIEF. Not others belief, but the belief in itself. Think of it like this, when you are a kid, you are told SANTA exists by your parents, and you believe it without question. Now imagine if what you believe comes true in reality. THAT'S HOW THE INK DEMON WORKS. In the tapes around both BATIM and DR the ink demon is described as a SOULESS monster that kills everything that moves, however in the first tape in the timeline that mentions the ink demon, it's not aggressive. That's because it was just born, with no ideals, a blank slate like a sheet of paper waiting to be drawn on. As it heard the other peoples words (as susie states it has good hearing) Likely Joeys, it was told it was a monster, that it was soulless, and as the ink demon was just created it was in a very influenced state, like any child is, it believed what it heard, thus becoming the monster.
This also explains why it devours people, it's trying to devour the soul it thinks it doesn't have, that's why it was after Audrey, logically it thought that with her being another creation of Drew that had ‘a soul’ that it would be complete.
Now onto susie campbell, I BELIEVE (again pun not intended) that when studying the ink demon, GENT and Joey manipulated Susie before she was infected with the ink. She believed she would become Alice when she came into Joey's office that day. So she did. The reason she's imperfect? Doubt, she would obviously have it, she was replaced as Alice's voice actor when she was Alice so a part of her will always be doubting that she is Alice. That's also why she's still mangled after her encounter with the ink demon. We know people can't really die in the cycle so the reason injuries often stay when they come back is based on the belief and the trauma that person holds. I could even argue that the injury itself might have just come from the ink demon touching her and her believing his malformed self would corrupt her as she strives for perfection.
I do think there are exceptions to Joey's rule of belief in the ink realm, that being creations that he made in the cycle like Allison, Tom and Audrey, Wilson as he appeared after Drew had died thus his hold over the ink realm had lessoned, the ink becoming more sentient itself thus having its own motives BUT THAT IS A THEORY FOR ANOTHER DAY.