Esther's hair is black and reaches about her waist. Her eyes are a dark, dull blue that almost looks gray. In her first appearance she's dressed in a pikachu hoodie, which is why most fan depictions of her feature her in that or a similar with pikachu ears adorned outfit.
Esther is quiet and introverted, and has an interest in reading. She seems to have a taste for mascot costumes, as she has dressed up as both Pikachu from Pokémon and Kyubey from Puella Magi Madoka Magica. Esther owns a car and can drive.
- She and Hitomi ship L and Light from Death Note