Chico

Self-proclaimed "mascot" of the show, Tico is Rigodon's best friend and former partner in the circus. The pair are inseparable, but Rigodon was forced to hide Tico from Mr. Fog at first, concealing the small hamster (he has a hamster's tail instead of a mouse's, which means he cannot be a mouse) within his travelling bag until their journey was underway. Tico is well known for his epic appetite, and is rarely seen without his "sun-clock", an archaeological artifact gifted to him early on the trip that uses the sun to tell time. Tico is the only case in which the original version and English-language dub differ on a character's nationality: in the original version, he is Spanish, while in the dub, he is Italian.

(Source: Wikipedia)