FAKE（The Pretender）

SCP emergency report: Subject SCP-CN-████, code name FAKE. In social situations, FAKE people are masters of disguise because they switch masks faster than a phone keyboard changes input modes. One second they are your best friend, the next they are the stable, reliable employee when the boss walks in. You think you met someone who truly understands you? Wake up. You just met a high-performance humanoid built for camouflage. When the lights go out, they peel off mask after mask and discover that the masks are what built the self.