Flint

A human blacksmith that Kai asked for help during the Terraria campaign. Kai opened a portal with his Vault Key to his extradimensional vault, wanting to get an opinion and help upgrading Kai's own, and only sword, which was purely for costume purposes.
Flint does know how to fight, at least out of desperation, using his ebonstone forge hammer, and can sell basic blacksmithing tools. He can gain the ability to sell local ore as well, depending on certain circumstances.