Grover

Grover, also known as Grover Monster, is a Muppet character on the popular television show Sesame Street. Selfdescribed as lovable, cute and furry, he is a blue monster who rarely uses contractions when he speaks or sings. Grover was originally performed by Frank Oz from his earliest appearances until 2001. Eric Jacobson began performing Grover in 1998 he has performed the character regularly since 2001, although Oz still performs him occasionally.

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Source: Wikipedia