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The MCU Already Has A Non-Skrull Shapeshifter Hiding In Plain Sight
Ahead of the return of the Skrulls in Phase 4's Secret Invasion, Phase 3's Spider-Man: Far From Home already introduced one shapeshifting character who could be impersonating anyone. In Marvel Comics, the Skrulls are an entire species of aliens whose shapeshifting subspecies became a force to be reckoned with across the universe. They have been subjugated by the Kree Empire, but they have also attacked Earth multiple times in their quest for power. The MCU has depicted them as a more benevolent race since their introduction in Captain Marvel, where they only want to defend themselves from the Kree.