You can go back in time and change anything you want about Ben 10. What are you changing?

I'd just get rid of the entire concept of Anodites. I find them lame. They took the one thing Gwen was good at and just stripped it away in favor of her being an alien hybrid. I liked it when Gwen literally just knew magic because magic was just a normal thing anyone could learn to a degree, or even just take a magic weapon or artifact. The idea of her "Spark" giving her magic abilities is dumb.