Name: Ayla Ranzz of the planet Winath
The twin sister of Lightning Lad, Garth Ranzz, and younger sister of Lightning Lord, Mekt Ranzz, Ayla gains her powers with her two teen brothers on the planet of Korbal in the 30th Century (SB No. 147/1, Jun 1968: "The Origin of the Legion!").
Ayla first joins the Legion of Super-Heroes while masquerading as her brother, Garth (who is thought dead at the time) (Adv No. 308/2, May 1963: "The Return of Lightning Lad!").
She later loses her lightning-hurling ability and develops a new power: the ability to make things super-light. Ayla then changes her codename to Light Lass (Adv No. 317, Feb 1964: "The Menace of Dream Girl").