How to make someone smile

My robot's name is DeMarcus Mathhesis. He is going to make people smile.He's going to make them smile by dancing.He will dance for kids, toddlers and babies.The way he is going to move is with strings.I'm going to connect strings to a part inside the robot and when I pull the strings, certain parts of his body were going to move. I will also find a way to make him display lights when he dances. So when I pull the string, something clicks a button and lights up. He is going to be made out of plastic and cardboard.