she's the mascot of tokyo metropolitan police department https://twitter.com/MPD_yokushi
(her name is a play-on words of tewatasanai 手渡さない "don't surrender" and inu 犬 "dog" so she's presumably a dog)
also this drawing's original file is so big... i sort of wonder if i should make it a print. i could totally add safety protocol reminders to it and you can hang her up in your town lol
no running in the streets!! always look both ways before crossing the road!!