Read more about XS at: Wikipedia

Official Site: DC Comics

XS (Jenni Ognats) is a character appearing in media published by DC Comics, primarily as a member of the Legion of Super-Heroes. She is the granddaughter of Barry Allen (the second superhero known as the Flash), and cousin of Bart Allen (the second Kid Flash). Her first appearance is in Legionnaires #0 (Oct 1994).

Despite being the granddaughter of Barry Allen (the Flash) and the daughter of Dawn Allen (one of the Tornado Twins), Jenni Ognats did not at first display any signs of super-speed. However, the Dominators, knowing her family heritage, captured her. This did not keep her out of danger, due to the long-standing feud between the Allen line and the Thawne line. As a baby, she was held hostage by President Thawne, only escaping danger when several Allens backed down.

At the sight of her father Jeven Ognats of Aarok being tortured, her latent super-speed powers activated. She managed to escape with her father before stray fire from the Dominators caused their base to explode. After this, she checked herself into a laboratory to help her learn to coordinate herself at super-speed. Once she learned control, she was drafted into the Legion of Super-Heroes. She eventually learned to overcome her initial fear and nervousness, while she developed crushes on Cosmic Boy and, later, M'Onel, and eventually dated Dyrk Magz.

During the Legion's first trip to the 20th century, XS was separated from them. She met her cousin Bart Allen (Impulse), becoming a good friend. She revealed how she was participating in an archeological dig in the future. XS fought side by side with Impulse and other speedsters during the events of Dead Heat. Afterwards, the 27th century Flash fixed her grandfather's Cosmic Treadmill, enabling her to go home. Unfortunately, she overshot, encountering two further future incarnations of the Legion before returning. Impulse left her a goodbye note in the building that she was participating in excavating.

XS has not been a contender in any CBUB matches.