crystalscorpiomoon
To describe someone's character. I came up with two possible interpretations: someone who's financially stable or someone who hoards wealth. Any other ideas?
I would agree. Also comes up for Earth signs, earthy types, grounded, people. I've also seen 4 of pents come up sometimes as a jealous person under the right context.
A wealthy successful businessperson who does not enjoy their wealth, does not use it to make themself or others comfortable.
Someone who is incredibly stubborn and stuck in their ways. The 4 of Pentacles would emphasise that aspect of the King of Pentacles for me. Also, as Pamuya said, a miser - Scrooge McDuck. A very powerful, wealthy person - the 4 of Pentacles is "Power" in some decks.
If you're looking for investment, this person is a very good backer but they will expect much in return. If you're looking for a partner - they will give you a lot of security but will want to be in charge. You'd need a strong, confident personality yourself to make sure you didn't get drowned out.