I would love to see any of the kids from the first three Digimon seasons. I was a huge fan of the show as a kid. Mimi, Izzy and Davis were my favourites. Rika was my favourite tamer, and man, her fashion sense has stood the test of time. I would wear that outfit today.
Here are some suggestions that I'd think be good: The Rowdyruff Boys Invader Zim Legend of Korra Adventure Time Charlie Brown The Boondocks The Simpsons Kids Yu Gi Oh (The original series) (Maybe even some Disney Princesses)