Art by: Nixen and Jettnigh
Okay so I have a theory about Ein.
So Ein is actually Michael's son, and he placed a forever potion on Ein to make him evil. So all the things that Ein did in high school wasn't his actions and he wasn't in control of himself, so deep down his soul was in pain and guilt. And what he did in TES wasn't even his actions, he didn't want to kill Aaron or do that to Aphmau, Lucinda and Zane. He didn't mean to beat up Kasey.
Michi is the one who saved him. When she got him to Micheal, he managed to fight the potion and beat it. When Michael wanted him to do that again and give him a forever potion again, Ein didn't want to and argued with his father.
Micheal refused and forced Ein to take the potion, making him suffer all over again.
Soooo ya! That's my Theory. And if it's true, I would feel super bad for Ein actually.
Ciao Adios!