"The Yo-kai world's king of prison breaks. He has escaped from a so-called inescapable prison four times. He intentionally allows himself to be captured so to enjoy his "game." His partner-in-crime is Sam."
Mass Mutterer has an uncanny resemblance to Manjimutt, except that he himself is taller and muscular. He has tan skin, brown body fur, eyes with golden yellow irises, black sclera, and pointed ends, sharp teeth, purple markings that are found surrounding his eyes, and black claws. His hair on the top was shaped into a tall turquoise mohawk while the lower part is brown and straight, and his tail is a large jagged wisp of the same former color. He wears prison clothing, hence his original name, that are ripped in many places, mostly at the ends, and broken chains on his wrists and one on the right ankle.
Mass Mutterer was frequently seen holding Sam, who is supposedly a character that debuted in The Great Escape minicorner. Unlike the original, this version of Sam has sharp teeth and stitches on his body and mouth.
Mass Mutterer appears very occasionally after capturing a set of Yo-Criminals, you can be awarded a lot of points for beating him. In the Sukiyaki version he can also be battled as a boss in the Busters-T mode.
Befriended (Yo-kai Watch: Wibble Wobble/PuniPuni): "That's right!! I've fallen for you!! Damnit!! (Japanese: そうだよ!! 惚れちまったよ!! コンチクシヨーーーーツ!,That's it! I couldn't stop myself from taking a liking to you! Daaaaarn it!)"
Some of Mass Mutterer's traits are carried from the anime, specifically, from Manjimutt Season 2: The Great Escape, such as his name and appearance -which mirror Manjimutt's stay in Alcatraz- and his usage of Sam.
Mass Mutterer is based on Manjimutt's stay on Alcatraz in the "The Great Escape" corner of the anime.
Mass Mutterer is a portmanteau of "mass murderer" and mutt.