Who plays Nini in High School Musical: The Musical –The Series? This image appears in the gallery:Get To Know Olivia Rodrigo – 10 Facts On The Drivers License Singer 6. Who plays Nini in High School Musical: The Musical –The Series? Nini in High School Musical: The Musical –The Series is played by Olivia Rodrigo. 11 images See the full gallery: Get To Know Olivia Rodrigo – 10 Facts On The Drivers License Singer