Jaiko Goda is the sister of Takeshi "Gian" Goda, existing in Nobita Nobi's original catastrophic future timeline. In this scenario, Nobita marries Jaiko, resulting in severe financial hardship and inherited debt affecting their descendants, including Sewashi Nobi from the 22nd century. These dire circumstances drive Sewashi to dispatch Doraemon to the past to reshape events. Gian exhibits protectiveness toward Jaiko, often shielding her from trouble despite her self-reliance. When Doraemon's intervention improves Nobita's future, Nobita marries Shizuka Minamoto instead, averting the negative consequences tied to marrying Jaiko. This alteration ensures Jaiko remains outside the problematic lineage that initially necessitated the time-travel mission. Jaiko primarily functions as a narrative representation of the undesirable future Nobita must escape. Her existence highlights the critical stakes involved in transforming Nobita's destiny.