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Dejen is a member of the synth community of Acadia.
Unlike most of his comrades who accept DiMA's judgment of the Sole Survivor's trustworthiness and treat them kindly, Dejen is highly suspicious of the newcomer and makes no effort to hide it. Successfully completing the quest he offers yields a grudging thanks from Dejen but doesn't change his overall unfriendly behavior afterwards.
Interactions with the player characterEdit
At some point Dejen tasks the Sole Survivor with hunting down a Courser that followed Chase to the Island all the way from the Commonwealth because she, as he puts it, "screwed up", thus starting the quest Hunting the Hunter.