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Aidan Gallagher (born September 18, 2003) is an American actor and musician. His first major role was portraying one of the quadruplets, Nicky Harper, in the Nickelodeon comedy television series Nicky, Ricky, Dicky & Dawn. In 2019, Gallagher began portraying Number Five in the Netflix series The Umbrella Academy, which is his breakthrough role and has brought him widespread recognition. Wikipedia