Also in the future, Nate is an inventor. So is Crazy Dave. So my theory is Nate invented a machine that changes his hair color, he invented Penny, then he went back into time and his mental state deteriorated, turning him into Crazy Dave.
Neurodivergence in general is linked, not 100 percent going to cause queerness, I am on the autistic spectrum and gay, and this is my first theory in general, so it isn't very good or accurate (just based off of observation.)
Nate pvz3=G A Y; Queerness has been linked to neurodivergent behavior. In the graphic novels, Nate has been seen handing ducks to people so he could eat pizza from his socks. Neurodivergent behavior? Straight people tend to not have bandages on their noses; Pizza shirt=pizzaphile? In the future of the pvz universe, humans are extinct except for Patrice and Nate, making them have to mate if they want to repopulate. His design is more feminine. Gay males are typically more feminine than straight males. Nate is bicurious confirmed!