Stanley Pines is one of the uncles of Mabel Pines and Mason Pines. His main business is a salesman. He devotes most of his energy to selling and selling souvenirs in the store at high prices. Because he is too greedy for money, most of his income is illegal. When he is closed, he watches TV at home.

He often gives the twins drudgery that they consider shameless and unpredictable, but he protects and loves them unconditionally.