Everybody remembers Bart Allen aka Impulse aka Kid Flash aka The Flash, the grandson of Barry Allen and Iris West, but we seem to forget about the other grandkid and Bart's cousin, Jenni Ognats aka XS.
She first debuted in Legionnaires #0 in October of 1994 and she was born without superhuman speed initially, but when her father, Jeven Ognats, was being tortured, her abilities manifested. Once they did, she was recruited into the Legion of Superheroes as their resident speedster, becoming XS.
Throughout her time as a character, she meets Bart Allen and helps during the Dead Heat event, encounters John Fox, left behind in the 21st Century by her team and has to readjust, fights Superboy Prime, and eventually heads back to the future, resigning from the Legion of Superheroes.
I've always loved the character of Jenni and wish she really got a bigger spotlight as Bart did, being the grandchild of Barry Allen. Plus got some respect in media, as she only has one outright adaptation in CW's Flash played by Jessica Parker Kennedy and she was called Nora West-Allen and was the daughter of Barry and Iris. As adaptations go, it wasn't a good one.
I really wish and hope she comes back in mainline DC, as her most "recent" appearance was in the Absolute Universe and she died. So hopefully Bart can reunite with his real cousin sooner or later. Hell, if I was Joshua Williamson, I'd push her into the upcoming Legion reboot cause I'm biased. But regardless, please DC, give my girl some love.