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.
Now that Phase 4 includes an upcoming Secret Invasion series, one may wonder why the Skrulls would want to infiltrate Earth. But if Talos' impersonation of Nick Fury and Soren's impersonation of Maria Hill in Spider-Man: Far From Home is anything to go by, it's possible that many Skrulls have already infiltrated human society since at least the 1990s. What motivation may lead them to the events of Secret Invasion is still a mystery, but Spider-Man: Far From Home secretly introduced one shapeshifter who is certainly more villainous than any Skrull.
Related: Why MCU Phase 4 Is So Much Darker Than Phases 1-3
In Spider-Man: Far From Home, Dimitri Smerdyakov assisted Talos while the latter posed as Nick Fury. Smerdyakov drove Peter Parker to Prague so he could receive his stealth suit and fight the Elemental «Molten Man.» In the comics, Dimitri Smerdyakov is none other than «the Chameleon», the first villain Spider-Man ever fought. Half-brother to Sergei Kravinoff a.k.a. Kraven the Hunter, the Chameleon grew up trying to impress him, and used his impersonation skills to forge a criminal career, fighting Spider-Man multiple times
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