Hero Muller is a Dutch

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 voice actor

Muller performs the voices of Cookie Monster

Cookie Monster

Cookie Monster is a Muppet on the children's television show Sesame Street. He is best known for his voracious appetite and his famous eating phrases: "Me want cookie!", "Me eat cookie!", and "Om nom nom nom" . He often eats anything and everything, including danishes, donuts, lettuce, apples,...

 and Herry Monster on Sesamstraat

Sesamstraat

Sesamstraat is a children's television show in the Netherlands, spin off the popular U.S. children's program Sesame Street. In its early days the show was broadcast in Flanders as well. It is the second longest running foreign adaptation of Sesame Street without interruptions, behind only...

, the Dutch co-production of Sesame Street

Sesame Street

Sesame Street has undergone significant changes in its history. According to writer Michael Davis, by the mid-1970s the show had become "an American institution". The cast and crew expanded during this time, including the hiring of women in the crew and additional minorities in the cast. The...

. Hero took over both roles from the late Peter Piekos

Peter Piekos

Peter Piekos was a Dutch voice actor.Piekos was the original voice actor for Cookie Monster for Sesamstraat, the Dutch co-production of Sesame Street...

, who could not be located at the time.

Cookie and Herry used to sound almost alike; in recent years, Hero has tried to make Herry's voice a bit more nasal.

Unlike the original English-speaking Cookie Monster, the Dutch "Koekiemonster" uses correct grammar in his speech.

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