Olli is a Dutch children's book character and a stuffed toy. The character Olli was original created in 2004 by Dutch designer and film director Hein Mevissen and writer Diederiekje Bok as a character for a bottled mineral water. Olli was one of many characters used on the packages and posters of the bottled water brand and John's Phone. Olli was launched at a party of MTV In Rotterdam in 2004. In 2013 Olli was again part of a campaign. This time to save the Rotterdam Zoo Diergaarde Blijdorp. Olli is part of the Ollimania family which is the company that created and owns all characters. Olli became a national hype in the Netherlands from the launch in 2004. After the launch Olli became the symbol of Rotterdam and professional football club Feyenoord. On 10 September 2015, Ollimania and its creators Hein Mevissen and Diederiekje Bok donated a huge Olli statue to the Sophia Children's hospital in Rotterdam.