Schwi (シュヴィ, Shuvi) was the first Ex-Machina to be introduced in Tet’s story which he was telling Izuna. In the story, she seeks to understand the human heart and was found by Riku.
Schwi bears many similarities with Shiro, but with several differences, the most prominent being two tails that come out from her back, and other machine-like features that protrude from around her body.
She has very pale skin, long, messy black hair (dark violet/maroon in the movie) and red eyes (yellow with blood red curves and black pupil in the movie). She is very slim and quite short. As an Ex-Machina, it is normal for her to not be wearing any clothes.
During her time with humans other than Riku, she wore a robe to cover the mechanical parts on her body, including the piece on her head. However, the tail was uncoverable (as it was her power source), therefore Riku decided to go calling it “equipment”. While she does resemble Shiro, it is likely that Tet construed both Riku and Schwi’s appearance to resemble Sora and Shiro in an attempt to show connections between the two groups. This is pointed out by Izuna who believed Tet was lying about certain parts of the story. Tet confirmed some portions of the story were false only moments later.
Before she made proper contact with humans, Schwi’s behavior was similar to that of a stereotypical artificial intelligence. She could absorb and process data and intelligence very quickly and act in the appropriate manner – a unique characteristic of her race.
However, she seemed to have difficulty in comprehending emotions and desires, otherwise characterized by her as the heart. Over time spent with Riku, she seemed to have started to develop her own heart. Her expressions and feelings became more vivid over time.
After setting her personality to mimic that of a “shy Imanity survivor”, and spending a year around Riku’s colony, she was unable to reset her personality back to the default monotonous mannerisms of the Ex-Machina, stating that she was “stuck” in that mode.