DevilDice

DevilDice is the slash ship between The Devil and King Dice from the Cuphead fandom.

Canon
King Dice first appears in "Roll the Dice" (S1E5). Although he is supposed to be his self-proclaimed Number One, the Devil doesn't really seem to pay attention to King Dice, sometimes even forgetting who he is, until he tells him that he has captured Cuphead (which is not true). The Devil finally calls him his Number One, but not long before he warns him that he "hates disappointment". When he learns that King Dice has let Cuphead escape, he threatens him without restraint, then tells him that he is no longer his Number One and fires him as the host of Roll the Dice. King Dice seemingly tries to have a chill and easygoing approach towards his boss, though, The Devil seems to have more respect for Henchman than him.

In "Release the Demons!" (S2E8) King Dice enters the Underworld through a cave after the Devil accidentally disintegrates his finest demons. When King Dice comes across the remains of the demons, he is left startled upon notice. After having to comply with his third finest ranking demons, the Devil releases them from the underworld before King Dice realises he is also required to get Cuphead's soul, as he too runs out from the gates of the underworld. When he arrives at the corn maze, that Cuphead and Mugman are at, he eliminates the demons one by one so he can catch Cuphead himself. However, his actions are discovered by Henchman, who immediately reports to the Devil that King Dice is the only one left, though Henchman didn't tell him that the latter had killed all of them. King Dice is then shown dancing in triumph through a magic mirror. Later, he places himself above the maze exit with a net waiting for the opportunity to pounce on Cuphead. Unfortunately for him, however, when he notices the Four Horsemen, which the Devil also released, King Dice turns very pale, leaving him frozen with fear. Later, when two visitors notice him, they proceed to call him lame.

Fanon
This shipping started mostly after the Cuphead game was released. One of the main reasons this ship is so popular is probably their similar, yet with significant differences, personalities. Both are villainous soul stealers in positions of power, but while the Devil is dreaded and feared by the residents of Inkwell Isles, King Dice is a villain with good publicity and adored by the masses. Their soul stealing tactics are exact opposites; the Devil's carnival steals the souls of those that lose the games there, while King Dice's game show steals the souls of the winning contestants. The Devil's first instinct to getting Cuphead's soul is to chase him down and attack him with fire, while King Dice only resorts to violence as a last resort. Neither of them like Cuphead, but the Devil slowly (albeit temporarily) bonds with him over their shared sense of humour while King Dice progressively hates him more and more as Cuphead continues to fail his (rigged) game show.

Fandom
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