Full Name Milli
First Appearance (Barney and the Rocko Squad) Enter the Rocko Squad
Barney and the Rocko Squad Portrayer Madeleine Rose Yen
"This road sure is bumpy..."
— Milli in Umi Fire Truck, while riding Umi-Car on a bumpy road.

Milli is Geo's sister and the leader of Team Umizoomi, just like Evil-Man is the leader of the Rocko Squad. Her powers include:

  • Milli Measure
  • Pattern Power
  • Sleeping

The third power listed above is the first power not used in Team Umizoomi. Geo likes it when his sister is sleeping (he helps her stay asleep), but Evil-Man hates it, like when Alisa and Xiaoyu are sleeping (he tries to wake her up).

She also stole Meteorite's most famous line in Team Umizoomi vs. the Shape Bandit with the words "You said it, brother!".

Madeleine Rose Yen voiced Milli in Team Umizoomi (The Butterfly Dance Show and Season 2) and Barney and the Rocko Squad.