As seen in Pearly Shells and Desert Island, Brother and Sister are both very playful, and usually act energetically while coming up with ideas to solve the situation they are faced with. If excited or pleased with the results of a plan, they do a "victory dance" to express their delight.
Brother is shown to be a Latino boy with short black hair. He wears a turquoise blue T-shirt, bright red trousers and white sneakers with pink laces.
Sister is shown to be a Thai girl with hip-length black hair in a long ponytail. Her apparel is a red T-shirt, bright blue capri pants and the same type of shoes as her sibling.