To be honest, I sometimes wonder how much you need to go to school in order to learn how to write a good character. I mean, there are some things people can catch on by actually reading good literature and other stuff.
The problem is really more in the fact that Enter for his own shit has also some of the worst ideas for world building imaginable on his hand.
Like, the designs he wants to work with are too saccharine if you ask me, his world is somehow simultaneously not too far out there in terms of imaginative premise (compared e.g. to KND) yet also it is too far out there compared to stuff like Hey Arnold or Recess, his story ideas are dull etc.
Enter if anything needs to start not just from scratch with the characters, he needs to start from scratch with the world he has in mind.