- "I'm XS. How schway is that?"
- — Nora West-Allen
Nora West-Allen (born c. 2396), nicknamed XS by her mother, Iris West-Allen, is a female meta-human speedster and a time traveler from a possible future. She is the daughter of Barry Allen and Iris West-Allen as well as the older sister of Bart Allen.
According to a version of Eobard Thawne from 2388, Barry's daughter was supposed to be named Dawn, presumably referring to Nora in the original timeline. Among her early pseudonyms suggested by Lia Nelson were Lady Flash, Flash Woman, and Femme Flash. Thawne had nicknamed her Little Runner. Her cover identity during her brief time as a villainous speedster was Jenni Ognats.
In a previous timeline, Nora went back to the past to finally meet her father and became a part of Team Flash, working alongside her parents and their friends. However, unbeknownst to the team at the time, Nora was working with Thawne, who was imprisoned in 2449, on an agenda to destroy Cicada's dagger and save Barry from vanishing in a future crisis. After Team Flash defeated Cicada by administering the meta-human cure to her younger self and destroying her uncle's dagger, Nora was erased from existence once a new timeline began to set.
At some point after Nora was erased from existence, Wally West viewed multiple futures and he saw her running in one of them, indicating that she would be born at some point in the future.
In the current timeline, Nora is a vigilante operating in 2449 who fights meta-human criminals such as Godspeed alongside her younger brother Bart. During one fight with Godspeed, he went to the Flash Museum and used the Cosmic Treadmill to travel back in time. Fearing that they would never find him if he got away, Nora and Bart broke their family's number one rule and decided to follow him eventually ending up in the present.