This guys looks like ADVENT Hybrid soldiers, but they are from UFO Defense : r/Xcom
Steam Workshop::Allies Unknown Species Mod: Rogue ADVENT Hybrids
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XCOM 2 Commander - Riley 02 by Laitiel on DeviantArt
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I wanted to make a comparsion between the different desings of the Advent Hybrid soldiers so far : r/Xcom
XCOM 2: A Diamond in the Rough - Fextralife
Steam Workshop::Allies Unknown Species Mod: Rogue ADVENT Hybrids