The Flash IV
Real Name: Carrie Allen
Known Relatives: Barry and Iris Allen (parents), unnamed son
Base of Operations: Central City?
Group Affiliation: Justice League
Years Active: 1986–2006 (est.)
Appearances: 1986 (G2 #3), 1997 (G2 #3), 2008 (G2 #4, retired)
The fourth Flash had only recently joined the Justice League in 1986 when she and other Leaguers tried to apprehend an increasingly unstable Batman. She remained active at least through 1997 and probably later.
Carrie appears along with the Wests and Allens in 2008, holding a toddler, presumably her son. Given this, and the fact that Iris appears to be pregnant in 1964, it seems likely that Barry and Iris might be her parents. This would make her about 21 in 1986, which is about right for a non-sidekick superhero debut. It’s unclear who the father of her child is, but she was seen flirting with Green Lantern Kyle Rayner in 1997—whether they (a) had a relationship and (b) continued it are unclear.