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Maybe he is out of step with the rest of society. For example maybe he wears clothing that is considered out of date with current styles in his culture. In Issac Asimov's short story/novel "Bicentennial Man" the character of Andrew Martin wore clothing of a style that was several decades out of date compared to what natural born humans wore perhaps your character could do something similar, or he used slang that the other characters don't. When I was a teen words like Tubular, Rad and Knarly were popular slang terms but if a kid were to use them now they might get some odd looks.
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