In cartomancy with playing cards, Kings are almost always significators for men. On rare occasion, Kings can come up to signify action, judgments and protection.
In some systems, the significators for the querents vary, but in the one I have been taught, it’s normally the Queen and King of Clubs that represent the querent.

The King of Hearts is a family man. He can be a father, a brother, an uncle, etc. For a gay man, the King of Hearts can be a partner. He is a good man, one who has an interest in the querent’s welfare. He is the archetype of the philanthrope. Even when he is not close to the querent, he is warm and kind. Even on the rare occasions when it doesn’t stand for an actual man, the card symbolizes a positive opinion of the querent (for instance, a judge ruling in the querent’s favor or a public servant furthering his aims). It shows positive outcomes thanks to protection. In general, it shows action taken in favor of the querent.

The King of Clubs is the male querent or the female querent’s male partner. When this figure doesn’t exist, he still represents a man, not necessarily related to the querent. Broadly, the card speaks of action, a positive role model, fair judgement and fair procedures.

The King of Diamonds is a man who is not close to the querent. He can be an acquaintance, a boss, a professor, a businessman. He is a person of good means and, like the Queen of Diamonds, one who follows primarily his self-interest, though he is not necessarily evil. He can be a rival in love in the appropriate context. Even when it doesn’t represent a man, the card symbolizes financial institutions, decisions concerning money and situations where there are interests at play that are greater and more powerful than the querent’s.

The King of Spades can be the male counterpart to the Queen of Spades, a man who is lonely, bitter, a rival, an enemy, an ex etc. He can be a difficult person, a bad father and all the things that apply to the Queen. However, the allegorical meaning of this card is also quite common, in that it represents the law itself, as well as a doctor or even the concept itself of medicine. It signifies great power being brought to bear on the querent, often in a cold and impersonal manner, if not altogether antagonistic. With negative cards it also signifies evil deeds and the will (and ability) to hurt