Barnaby and Jan
Funnily enough, Jan had been watching the balloon as well. She had thought about flying up to retrieve it for the kid, but before she could actually act on it, someone else beat her to it. She was amazed to see a glowing blue man jump so high into the sky, landing back as if it were no big deal at all. She pushed her way past the people, more concerned about trying to find this superhero than to play any games or ride on any rides.
She saw him give the balloon back to the child, smiling at the action. She didn't recognize him and wondered if he was a hero from another universe. "Hey!" She called out, making her way over to him. "That was really cool what you did! Probably made that kids night!" She beamed up at him as she got closer. "How do you do that? Are you a superhero?"