A soft-spoken, mysterious girl whom Riku and his friends meet in GBN. Her amazing intuition allows her to sense the special feelings that have been put into a Gunpla.

She appears to have a strong sense of intuition about Gunpla and the GBN world in general. With a single look, she is able to see the amount of love that the builder had put into a Gunpla, as well as the 'feelings' that it has. She can also sense where a person is in the GBN World, and point out the location on a map. She has the ability to create a barrier to protect herself or her companions from harm.

As an electronic lifeform (EL-Diver) within GBN, Sarah's growth causes bugs to occur at an increasingly alarming frequency, and the GBN's system is being strained as her data increases, a result of her gaining more emotions and memories. Although the system still had some room to tolerate it, this would not last as the bugs would eventually surpass those of the Break Decals.