ELF Klein is much smaller compared to the original Klein, which makes her attire appear oversized on her. She has a white patch over her right eye and a belt with a green snake eye over her left shoulder that wraps around to her book by her waist side. On her head, is a black and gold headpiece in the shape of pointed ears and, on her behind, is a green and black stinger-like tail. The ELF is oftentimes seen carrying a large, black infinity-shaped syringe holder, either on her back or in her hands.
The ELF takes on a lot of original Klein's workaholic traits, as per Mobius's programming.
Mobius created ELF Klein based on original, human Klein, but hadn't inserted any of her human memories.
This doesn't stop the other inhabitants of the Elysian Realm from occasionally testing her and trying to see if she remembers anything from her "previous" life, like Elysia mentioning she used to pinch Klein's cheeks.
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