Star Merchant

Exclusive to the old Chinese version of Terraria.

The Interstellar Merchant (lit. 星际商人) is an NPC vendor who sells various exclusive items for both in-game coin and real-world currency.

He will spawn once the following conditions have been met:
 * There is an empty House.
 * All players in the game world total more than between them in their inventories.

Items sold
Unknown. The Interstellar Merchant's stock is not fixed and was instead determined by the game's remote servers. Given that the old Chinese version had been discontinued, it is unclear what exactly he sells if a player still has a copy of this version.