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Parasites are Alien worm-like creatures who invade the Earth in the Scf-fi horror manga/anime Parasyte. They take over the bodies of humans or animals. Parasites can control the human brain and once they have control over it, they kill the humans that get in their way. They are capable of shape-shifting into other humans, because of this, they can hide out among other humans as a means of escape. Izumi Shinichi is the only one that can't shape-shift, because his parasite, Migi, didn't take over his brain. The only human Parasite sympathizer was Takeshi Hirokawa.