You can see the King of Pentacles as a man with the following qualities or, if the the question concerns a woman, as the male part of her psyche. But I tend to reading the kings as the outward side of a person (job, typical ways of acting, the way the life is led...), no matter whether this person is male or female.
The King of Pentacles is a calm, steady person, conscious of values and tradition. He is rooted to the earth, is pragmatical, practical and knows the worth of property, good food, entertainment and other joys of the senses. He is reliable and loyal.
The King of Pentacles can be problematic if the consciousnes of values and tradition turns into rigid conservatism and patriarchy, if the pragmatism turns into mental rigour and the cherishing of material goods into niggardliness or crapulousness.