Esther is a new unit introduced in Metal Slug Attack.
A young woman from a minority people, she lives in an underworld with a unique ecosystem. Since this peace-loving girl became her clan's representative, conflicts have decreased and negotiations for a co-existence pact have been moving forward bit by bit.
She's able to perceive her surroundings even in darkness. This is due to her ability to sense a light emitted by all living beings, which is enhanced by her special face-mask. The caterpillar that's always with her is her friend, and shares her birth date.
She has much in common with Nausicaä.