Here is her character description, via IzanagiGames:
Binko (voiced by Yu Kobayashi) is Yurukill Land’s kimono-clad, mask-wearing guide. She is polite, and old-fashioned in her speech, yet when dealing with the Prisoners, she’s sharp-tongued and quick to ridicule. Variations of the phrase, “bin-bin,” are her trademark. Under the auspices of Yurukill Inc., she oversees the games offering the Prisoners a chance for acquittal at Yurukill Land.
Watch the trailer below.