Chickie used to wear her Cinderella dress every day, and while that was obnoxious in its own way, it at least had some endearing value. It was cute. People recognize Cinderella and smile. We all know the story and can relate.
Caroline had to pick obscure characters who no one even knows. Jack Frost is OK, I guess. Because Chickie is usually Elsa, Jack Frost is a close second when playing pretend. They have the same freezing powers so there's that, plus he has a cane and a cape, which makes it cool.