Milli (voice of Sophia Fox) is Geo's sister and part of the team on Team Umizoomi. Team Umizoomi works to help the children of Umi City solve problems and get out of dilemmas. Milli has a unique dress that can match any pattern, or even come up with an outrageous new one. Not only that, but her pigtails can grow out to become a thermometer, a scale, or a ruler. "Milli, Measure!