Sekhmet, otherwise known as "Mirage", is one of the Ancient Ones, a race of godlike beings that existed in the universe's early days and caused chaos and anarchy across the worlds just for the fun of it. She is a minor antagonist in the Kingdom Hearts Unlimited Saga, as she is one of the few remaining Ancient Ones not sealed away during the Titan-Keyblade Wars that came at the tail end of both the Age of Chaos and the Lands of Legend.
She first appears in "Return of the Keyblade" as one of several antagonistic presences in the Agrabah campaign, allying herself with Discord to set up plans for the future of that world just in case Sa'Luk failed to defeat the Keybearers during the quest for the Hand of Midas. Sekhmet later returns in the second trilogy as a member of Mok's Nightbreed Organization.
(To be further edited by Temhota)