Katma Tui was a member of the Green Lantern Corps. She was tasked with training recruits - including John Stewart and Kyle Rayner. She struck up a romantic relationship with Stewart, but it never became serious.
Stewart still cared for her, though, and when he learned she had been captured by Despero, he rushed to Kalanor to save her. She was working undercover, however, in a plot to overthrow Despero. The plan eventually worked, and Katma helped rebuild Kalanor. She offered John her love, but he had moved on to Hawkgirl
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