Usapyon B is Usapyon in Blasters gear, just like Jibanyan B and Komasan B, only Usapyon's suit allows him a hoodie to simulate his standard suit's helmet, and has a pair of simple, round goggles on his forehead.
His suit specializes in Terror Time. He can also activate Emperor Mode in Blasters, by touching a Great Orb.
After befriending Jibanyan B and Komasan B. Usapyon B can be befriended by finding in front of a record store in Springdale Street in New Yo-kai City and battling him once a day. (This can only be done in both Red Cat Corps and White Dog Squad are both linked. Nothing will happen if you just have Jibanyan B and Komasan B in your medallium.)
Usapyon B is based on a Ghostbuster, from the popular movie franchise "Ghostbusters", also referring to his debut in "Yo-Kai Watch Blasters".
In Yo-kai Watch Blasters: Moon Rabbit Crew, Usapyon B can activate Emperor Mode upon being exposed to the Great Orb, although this does not apply to the Invader Chip.
Jibanyan B, Komasan B and Usapyon B all got changed medals for the Western releases of Yo-kai Watch 3, They aren't Dream Medals like there Japanese counterparts.
For Usapyon B to show up in Yo-kai Watch 3 you need linked save data for both games so you need the red cat membership card and the white dog membership card as well as befriending them both through normal means, just befriending Jibanyan B and Komasan B without both Key Items will not work.