Mia Sinclair Jenness[1] (born December 14, 2005)[2][1] is an American teen theater actress. She was one of three girls who rotated as the star title character on the US tour for Matilda the Musical.[3] In the off-Broadway play Mary Page Marlowe, she portrays the 12-year-old version of Mary.[4] In 2018, she voiced the title character Nancy Clancy on Disney Junior's animated television series Fancy Nancy.[5] She also had an ensemble and understudy role on the 2014–15 Broadway production of Les Miserables.[6] She portrayed Lily Nill in the pilot episode for the TV series Panic.[7][8] She voices young Powder in the Netflix League of Legends-based series Arcane.[9]