A masked superhero patrols two of Tokyo’s busiest districts, on a mission to help Japanese citizens defeat the coronavirus. Its name is Koronon, and it’s a bulbous, bubblegum-pink cat. The crusader is a mascot—a person in a plush costume—with a big X slashing through the phrase “COVID-19” on its belly. Throughout the day, it prowls busy Ikebukuro and Shinjuku, handing out masks. Koronon also serves as a visible reminder to practice social distancing and hand hygiene, the pandemic equivalent of Smokey Bear’s forest fire prevention efforts as a spokescritter in…