Early lore here
https://youtu.be/5t_c1g__oqk?si=3crlngYv0yNyTrzA
After being taken to the time patrol by Athena she watches the actions of her brother and becomes disheartened. Over and over again she watches Haro kill and ruin lives in order to bring her back. From feelings of guilt and responsibility she becomes a time patroller to make up for the people who died in her name. She joins Athena's team with a Sans varient and Terra (a terraria character). However she is just a human so even after learning the basics of chronos she gets badly injured trying to save the inhabitants of a timeline during a mission and gets operated in by the Time Patroller's scientist. Her entire body turns to rubber and she becomes a balloon human. With modified lungs she's able to grow any part of her body to do more damage. Eventually through teachings from Athena and a powerful team to help her improve, she becomes one of the stronger Time Patroller's out there. (Spoilers to add later)
Possible romance with Saber but who cares I don't write romance 
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