Nyna Calixte is the Director of Imperial Intelligence under Darth Krayt's regime in Star Wars: Legacy (Dark Horse, 2006–2010), and separately, under the identity Morrigan Corde, an agent with a wholly different set of loyalties.
The double identity is the comic's best-kept structural secret. Calixte serves the Sith regime at cabinet level; Corde works against it; and the two names belong to the same woman, who has been running both for years. Ostrander and Duursema seed the reveal a long way out.
The second reveal is that she is Cade Skywalker's mother — which reframes a great deal of what has happened to him, and lands the series' running theme that in this galaxy nobody's parentage is ever a neutral fact.