Sathyn Andrano is a Dunmer merchant and owner of the local trade shop in Raven Rock. He only appears if having the trade shop built during the quest Setting up Shop. If the other is chosen, then the smith shop with Sabrina Vitellia will appear instead.
The Nerevarine has been asked their opinion on whether a smith or a trader should be brought into the colony. They should ask the colonists what they think, then report their decision.