I would bring back the stegosaurus because they seem to be underrated as a dinosaur. They always seemed to be intriguing due to their lack in stature compared to the giant ones. when I was a kid my mom would get me the little plastic toy dinosaurs and I would play with them and the little army figurines, and I would use the stegosaurus as a ally in my mind as they battled in my living room. It was an amazing imagination playing with them with not a single care in the world.