A couple potential improvements to Wilson that don't require much in the way of art assets:
1.) His beard is ridiculously large by anyone's standards, becoming almost as big as his entire body--so why not let him gain some minor storage space with the later stages of his beard growth that are just always available?
2.) Meat Effigies are more or less his thing, even though they are available to everyone else. They look like Wilson, and he has the tools to create them without having to go insane or into the ruins. I think it would be an interesting change if Wilson exclusively would be able to retain his items if he dies and revives through a Meat Effigy. Be it just the items held in his equipment slots or perhaps the whole shebang.