Eto is a character that first appears on page 76 of the 5th book in the series of Diary of an 8-bit Warrior and the 13th book of Wimpy Villager. He meets Runt in an armor shop at the town of Owl’s Reach. We know he is a human as he says things such as “server” “update” and “NPC”
When first meeting Runt in the armor shop, Eto mistakes him for a player but soon realizes Runt is a villager and explains to Runt how to get lots of emeralds on quests as Runt needs emeralds to buy an aeon forge.
Before meeting Runt, Eto was like almost every other human, hiding in the capital begging Aetherians for food. Eventually, he decided to ask an NPC for a quest, and eventually, he ended up in Owl's Reach. The quest was to get flowers for an armor recipe. He got 250 emeralds for it.
We have not seen Eto since this encounter but he may appear in later books.