Charlie Brown is a non-player character located in Great Kourend's Hosidius House, up the ladder in the House's small church. When spoken to he will reveal that he has journeyed to Great Kourend in search of luck and fortune, and wears monk's robes to keep him holy when praying to Arengeesus, the Goddess of Luck.
He claims those who praise Arengeesus enough to get her attention are rewarded with luck on the adventures of those who praise her. The player then attempts to refute the statement by claiming hard work is all that's needed, but Charlie Brown believes that perhaps working hard is a form of praise to Arengeesus.
The deity Charlie Brown worships, Arengeesus, is a denomination based on the phrase Praise RNGesus, which is often said by people in situations that are determined largely by luck, chance, or randomness in online games. It is derived from RNG, which means "random number generator."
Despite referring to Arengeesus as the "God of Luck", deities who are female are usually referred to as a goddess.