The official 2014 World Cup Mascot. If you haven’t met him yet this is Fuleco the three-banded armadillo.
Fuleco, comes from the Portuguese words futebol (football) and ecologia (ecology). The colors are yellow, green and blue, to represent the Brazilian flag. His goal during the World Cup is to raise ecological awareness.
To learn more about Fuleco visit http://mascot.fifa.com/
Past World Cup Mascots:
Each FIFA World Cup since 1966 has its own mascot. World Cup Willie, the mascot for the 1966 competition, was the first World Cup mascot, and one of the first mascots to be associated with a major sporting competition. The mascot designs show some representing a characteristic feature (costume, flora, fauna, etc.) of the host country (source: wikipidia).