- This article was considered for deletion at Wikipedia on September 21 2014. This is a backup of Wikipedia:Hero_Muller. All of its AfDs can be found at Wikipedia:Special:PrefixIndex/Wikipedia:Articles_for_deletion/Hero_Muller, the first at Wikipedia:Wikipedia:Articles_for_deletion/Hero_Muller.
Muller performs the voices of Cookie Monster and Herry Monster on Sesamstraat, the Dutch co-production of Sesame Street. Hero took over both roles from the late Peter Piekos, 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.