- "Heya! ♪I'm Jerrin!♪ Check it out! I'm an amateur scholar of ancient history. To be honest...I've been focusing a lot of my research on shrines."
- — Jerrin
In Robbie's Memoirs, it is revealed that Jerrin was originally sent by Impa to Akkala when Robbie was 90 years old to assist him in his research. She proved to be a brilliant assistant who allowed him to automate the process of crafting ancient equipment and was able to modify the "Ancient Oven" named Cherry so she could speak Hylian flawlessly. Robbie was so impressed by her that the two eventually fell in love and married despite being half-century apart in age. However during their marriage, Jerrin became jealous of Cherry despite being a machine as Robbie had named it after his first love. Recognizing his wife's feelings, Robbie and her decided to restore the Ancient Oven to its original mechanical way of speaking and Robbie no longer referred to it as Cherry to placate his wife. Eventually the two had a baby boy they named Granté, and lived in the Akkala Ancient Tech Lab peacefully as a happy family. Unfortunately it was only a temporary peace as Princess Zelda did her best to contain Calamity Ganon. Eventually their son grew up and left home to journey the world, leaving his mother and father to their work. Robbie wanted to send their son to study under Purah at the Hateno Ancient Tech Lab like his mother had, but Purah told him not to send anyone causing her and Robbie to wonder what could have happened as they where unaware that Purah had reverted to a six year old child after an experimental de-aging Rune went too far.
If Link visits the Akkala Ancient Tech Lab before receiving the Side Quest "Robbie's Research" from Purah after taking her picture during the "Locked Mementos" Quest, he will find Cherry barely functional due to lose of power and finds no sign of either Jerrin or Robbie. Once the side quest is received, Link can visit the lab and talk to Cherry, who can still barely speak, though this triggers Jerrin and Robbie to appear. Robbie asks what he is doing their before vaguely recognizing Link. If Link talks to Jerrin, she reveals she considers him to be suspicious and refuses to talk to him unless he proves he is an acquaintance of Robbie's. After Link proves his identity to Robbie by removing his Armor (Head armor does not apply) and showing Robbie his old battle scars he received as a result of his injuries during the Great Calamity which Robbie saw when the injured Link was trusted to the care of Impa, Purah, and Robbie, Jerrin view of him quickly changes and she friendly towards Link, to the point she even poses while doing an impression of her mentor Dr. Purah, though she admits that it may have been a bit much since they met recently.
If Link asks her about Robbie, Jerrin reveals he is the Guardian researcher for the Royal Family of Hyrule and mentions he is her husband despite them being a half-century apart age wise, though claims that it didn't stop them from getting married or having a son whom Link can talk to Jerrin about. Jerrin also reveals that she is an amateur scholar of ancient history and currently has been focusing on studying Shrines, which reminds her about Zuna Kai Shrine on the left eye of Skull Lake. She tells Link to go search the left eye of Skull Lake where the shrine is located though states it is a challenge to get there as it is high up on a stone pillar. She also points out that the right eye of the lake is lower down and that he runs into Kilton, he is on the wrong eye. This results in the Shrine Quest "The Skull's Eye" in which she asks Link to go to the Shrine in Skull Lake, which he can reach through a combination of Paraglider and climbing, if he hasn't already. After he has completed the quest, she jokingly tells him that he doesn't have to tell her anything as she has a magical Sheikah nose implant that gives her a supernatural sense of smell and one sniff can tell her everything he did yesterday and what he ate for dinner last night before revealing she was just joking indicating she may have picked up Purah's habit of playing jokes on people. She notes by his dormant sense of humor things didn't go as smoothly as Link had hoped, though she thanks him for the report and wishes she could give him a reward, but they are short on funding as it is so they can't afford to pay him not even with food or materials, noting that is life in Hyrule. While talking about her son she asks if Link has seen him and if he says he's still a work in progress has she reveals she hopes he can takeover her research once he's done studying Armor. She will also note if Link changes his response to her question regarding her son.