This friendly little mouse, with the blue condom on its head, is Pi-po-chan, the mascot of the Tokyo Police force. Piiiiii-pohhhhh is the sound Japanese police sirens make, and "chan" is a familiar version of "san". So the name translates roughly as "Wee-wah-sweetie".
Yes, the cops in a city of 32 million keep order with a mouse. RESPECT MAH AUTHORITAH!!!
