Mondo Butter

Mondo×Butter is the cargoship between Mondo Owada and butter from the Danganronpa fandom.

Canon
Mondo never mentioned about eating butter or talking about it before in canon. Nevertheless, after killing Chihiro Fujisaki because of some sort of jealousy in Mondo, he got executed by Monokuma and at the end of the execution, he turned into a butter which was stored inside a container in which Mondo is seen "promoting" the product.

The process in which Mondo became a butter, was that in his execution it would show Mondo being strapped to motorcycle, spinning round and round inside a cage, which was named The Cage of Death, and at the end of the execution, it is seen a machine that pops out and then a moment later it appears Mondo already turned into a butter inside a container, for then being eaten later by Monokuma along with some pancakes accompanied with honey and coffee (which it's revealed at the end of chapter 2). During the Class Trial in chapter 3, Monokuma it's shown again eating pancakes with Mondo Butter which it's seen for a few moments.

In Danganronpa 3: The End of Hope's Peak High School - Future Arc #11, Mondo is seen resembling liquid butter, with his coat lying upon it, while accompanied with all the deceased of Class 78 morphed into how they looked when they died in the Killing School Life shown inside Makoto's hallucination.

Fanon
It is one of the most popular cargo ships around the Danganronpa franchise. It became popular after Mondo's execution in which it revealed him in a butter container. People then started making memes about it, in which some of these Kiyotaka Ishimaru could be included in them like in this image which shows Ishimaru being "feed" by the spectator with Mondo's butter while crying over his death. The image immediately became popular amongst fans which made similar versions of it like this other image. People would name this ship "Mondo Butter", since that after his execution, his butter container was called like that.

Nevertheless, like other cargo ships such as Kyoko×Cup Noodle or Aoi×Donuts, the ship is overshadowed by much other popular ships like Ishimondo and Chimondo in this case.

Fandom
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