Emeralda Kasim

Emeralda Kasim is a playable character in Xenogears.

Appearance and personality
While a colony of nanomachines, Emeralda has the appearance of a human child with emerald colored hair and orange eyes. If the party completes a sidequest, she grows into an adult form.

At the time she was awake, Emeralda had the mental level of a 3 or 4 year old, resulting in her having a rather child and direct nature. Being different from others, this gives her a bit of a complex.

Story arc
Emeralda is an artificial human created from nanomachines. She was developed by Kim Kasim, a former incarnation of Fei who existed during the Zeboim era. At the time, human beings had a short lifespan of approximately 30 years and suffered from genetic damage. Kim, analyzing the genetic pattern of himself, and that era's Elly, developed Emeralda, creating a being that was restructured at an atomic level. Emeralda's entire body is composed of nanomachines and she has the mechanical equivalent of a real brain for memory and thought. Being composed of nanomachines, Emeralda has the ability to change her body at will.

Emeralda is awakened by the party in the Ethos Dig Site, which reveals the Zeboim facility where Kim originally sealed her in. Having slept for 4,000 years, her memories were fragmented and vague and she doesn't communicate in any fashion at first. Krelian greatly desires her for the power and technology that she holds and sends Bishop Stone to obtain her, which he is successful in doing. Having Emeralda greatly advances Krelian's nanotechnology research. Having obtained any necessary knowledge from her, Krelian decides to send Emeralda to the surface in a Gear specially designed for her, Crescens, such that she can guard the third Gate protecting Solaris. She is defeated by the party and left in their care.

Emeralda is extremely excited to see Fei, thinking him to be her creator, Kim. She unfortunately doesn't recognize Elly, calling her an old lady at first. From this point on, Emeralda joins the party. When Fei and Elly are shot out of the sky by Ramsus and nursed back to health by Taura, Emeralda comes to see them along with Citan. Being told of a Mass Driver Facility nearby, Emeralda heads there with Elly to release nanomachines into the atmosphere that will release the land dweller's limiters.

In an optional sidequest, the party is able to visit the Lighthouse, which holds Zeboim ruins underneath it. Through the visit Emeralda regains more of her memories and thanks Fei for being a substitute Kim, telling him she'll make Kim and Elly proud that she is her child. At that moment she transforms into an adult.