Nora Allen

"You have such a good heart, Barry, and it's better to have a good heart than have fast legs."

- Nora to Barry Allen

Nora Allen was the mother of Barry Allen, the wife of Henry Allen, and a good friend of Joe West. She was killed by Eobard Thawne, collateral damage in his attempt on the life of young Barry.

Biography
When Barry ran home from school one day after being bullied, his mother assured him that he had a good heart, which was worth much more than having fast legs. Late that night, a Barry Allen and Eobard Thawne from the future sped in to the home and fought, circling Nora, and waking her husband and son. Eobard tried to get a clear shot to kill the younger Barry, but was dogged by the Flash when he transported his past self six blocks away from his home. Enraged, Eobard stabbed Nora in the heart before fleeing the scene. Henry was blamed for Nora's death and sent to jail.

Barry was sent back in time for a second chance to save Nora, but he was warned by his future self not to do it, considering the damage it would cause in the timeline. But this allowed Barry to have one last, heartfelt talk with his mother, confirming that her son and husband were safe in the future and that they loved her.

Legacy
Nora's death was incentive for her son, Barry, to join the forensics department - inciting a need to both learn how to investigate crimes and to study cases with unexplained elements - all with the deep-rooted desire to prove the circumstances of her murder true (that she was not killed by her husband, but by a man in a yellow suit who could move as fast as lightning) and to ultimately prove his father, Henry's, innocence. This quest was ultimately what led Barry down the path that would lead him to eventually become the superhero known as The Flash.

The Flash: Season Zero

 * "The Talented Mr. Bliss" (hallucination)

Trivia

 * Since Eobard was erased from existence when his ancestor Eddie Thawne committed suicide, in some sort of timeline, Nora's murder never happened.