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Alyx Vance
Alyx Vance is the deuteragonist of Half-Life 2 and its Episodes, and the protagonist of Half-Life: Alyx. The daughter of former Black Mesa scientist Eli Vance and Azian Vance, she is 19 years of age at the time of Half-Life: Alyx and 24 years old during the events of Half-Life 2, becoming a prominent figure in the Resistance campaign against the rule of the Combine.
This happens when Alyx meets Gordon for the first time in a building in City-17 on Gordon's way to Dr. Kleiner.