10. Jason Todd
When Dick Grayson hit a certain age, he felt like he had to step away from Batman and carve out his own identity as Nightwing. At first, Batman doesn’t want to bring on a new sidekick, but he eventually gives in and brings the troubled Jason Todd into his world.
I’d love to see how Dick, fresh off his tenure as Robin, reacts to Jason. Does he think he is worthy to carry on the mantle or does he see the darkness inside the child? Seeing how troubled Jason is would only make Dick look all the more level-headed and heroic.