LSTER-512 calls herself Elster, and is known colloquially as that as well. She is a Replika, or mass-produced biomechanical artificial human. She is very determined, work-focused and mentally and emotionally tough and resilient. She comes off as a little cold because of that. She isn't cold-hearted, though; when she loves, she loves deeply, and she is determined to find her love at the bottom of the Mines of Sierpinski no matter the cost.