Mochismo initially appears as a kakumochi (square rice cake) with thin arms and stubby feet, a strip of nori resembling pants wrapped around his waist. Normally he has a nearly featureless face with thin eyes and mouth and a burn mark that resembles a blush, but when angry a scowling face with flushed cheeks pops out and his arms get bulkier and stronger-looking.
Mochismo can give people spontaneous bouts of super strength, as he caused Nate's mom to lift a couch without difficulty.
In the manga, he makes people slow by placing mochi at their feet.
Mochismo plays a minor role in the game's storyline, during Protect The Seals!. He's one of the Yo-kai from the Yo-kai World that are inspiriting humans, and hides behind the seal next to the Springdale Community Center.
Mochismo appears under vending machines and cars by the Fish Place in Uptown Springdale, and in the Secret Byway in Blossom Heights. Also, he appears as an enemy Yo-kai alongside two Suspicionis in one of the chapters.
Befriended: "Hey, get a load of you! We should be friends, us two!"
Loafing:"I'm wiped out."
Being traded:"A new friend? I'm so pumped, I feel like I'm twice my size!"
Receiving food (favorite): "My favorite!"
Receiving food (normal): "Hrmmm..."
Receiving food (disliked): "Gross!"
Freed from the Crank-a-kai (YW/YW2): "You got me out? Let me at least carry your stuff for you. I'm strong enough!"
In the anime
Mochismo makes a quick appearance in Yo-kai Mochismo. Jibanyan asked Whisper, who did not have his Yo-kai Pad with him at the time, who he is, and Whisper answered incorrectly. Mochismo had caused Nate's mother to lift a couch effortlessly to clean better.