Finally I've finished all my headcannon kings designs

Spades
Berserker monsters of the Dark World that have no analogues in the Light world. They stand out for their aggressive temperament, the ability to fight well, do not know how to stop in time and almost constantly stick their tongue out. Responsible for guarding and protecting the Kingdom of Cards from enemies

King of Spades
"Soulless" monarch of the Kingdom of Cards, one of the four kings, who later overthrew the rest, forcibly appropriating it for himself. Follows the will of the mysterious "Knight"