Hey
Barkevious is a very cool name!!
Some of the behaviour you describe is totally normal. Moving his bedding and making his own nest is just him making his cage his own
nothing to worry about!
Using his wheel as a toilet, again something that hams do sometimes, especially robos!! Doeshe have a sand bath at all, as I found my pee in sand when it's there for them.
If he's running and hiding when you are around the cage, start by getting him used to your voice. Talk to him and he will hopefully get used to you being near his cage and your voice. That is the first step in getting him used to having you around