Thurston, Diane

ダイアン・サーストン

Diane Thurston is Axel's granddaughter and Renton's older sister. Following Adroc's death, she and Axel raised Renton. She departed from home several years ago, and for reasons initially left unexplained, her family has had no contact with her since. Although she appears in Axel's family photographs and as a silhouette in the series' opening sequence, her face remains unseen for the first 35 episodes; under various circumstances, her face in flashbacks and photos is consistently obscured. Much of the narration in the early episodes is framed as if Renton were writing letters to his sister.
Talho is unsettled by Holland's past relationship with Diane and reacts with anxiety when she is mentioned. Diane was obsessed with her father's research to such an extent that it impacted her relationship with Holland. The specific terms of their breakup were not fully explained, but they are connected to her desire to gain a deeper understanding of Adroc's work.
At some point, Diane somehow found herself in the command center of the Scub Coral. There, within a library artificially created by the Scub Coral, she and a small group of people read in order to understand the truth they seek. The vast knowledge they wish to acquire would take nearly a lifetime, and what remains is subject to their own volition. Although Diane told Renton they would stay together, the Scub Coral command center was destroyed, forcing Renton to leave in order to save Eureka and the children. It is suggested that the command center will return and that Adroc and Diane are alive and well, continuing their reading.