Thalia West (Earth Infinite)

Origins
Born under the influence of her ancestors, that lived in The Flash Mansion she was trained with the speed force and is the 5th Flash.

One day when her family was killed by The Thundrax she used her powers and killed The Thundrax and as double revenge she went after The Thundrax's family.

From there she did what everyone else in her family would do she became the crime fighting-speed-forced champion the flash.