He's a version of Topo (Nepoli in Chinese) from the short Neapolitan Mouse who is one of many labrats used to test an experimental psychotropic drug (in the form of poisonous cheese) created by a shady organization under the guise of a theme park
Deceased.
Napoli is relatively fond of playing with children
A total of 135 mouse subjects died in the experiments, with 83 of them being malformed due to the effects of the drug
396 unrelated mice also died as a result of these experiments