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Esker is one of the first Hearthian astronauts, and are located at their outpost on The Attlerock. They used to run the Lunar Outpost before the Space Program forgot about it, and in turn Esker themself. Now they just "keep an eye on things" from the outpost.
Esker occasionally shoots Little Scouts at the village on Timber Hearth, as a method of "one-way communication" with ground control.
Esker is incredibly lonely on The Attlerock as they no longer get visitors, since the space program grew more successful and less crashes are made. They repeatedly ask the player character to stay with them by the fire. They are also the first spacefaring Hearthian to appear in the epilogue.