He stars in one of Meg's Cases: Charlie's missing sleeping bag
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Despite his apparent poverty, he claims to be surprisingly rich. In the Postbag 31 edition of Postbag from the Hedge (dated 29 May2008), a player asked him how much money he had received. Charlie's response was: "in the region of maybe... a couple of billion these days, give or take a Christmas Cracker or two." Note that this was before the value of Christmas Cracker climbed to over a couple of billions.
Charlie the Tramp is a reference to Charlie Chaplin's famous character, "The Tramp".
During Meg's cases, it is revealed that Charlie's only two possessions are his sleeping bag and a very old grand exchange receipt, which if given to a Grand Exchange clerk, is revealed to be worth over 100 million coins. When the player tries to claim the money for themself, the Grand Exchange clerk pretends the money belongs to a person named Adrian, to which the player says is themself. This lets the Grand Exchange clerk know the player is lying about his ownership of the receipt.