6. Parasyte - The Maxim

Parasitic aliens suddenly invade Earth and take over vulnerable targets, intent on infecting as many as they can. Shinichi Izumi falls victim, but his parasite cannot take control of his mind and instead resides in his right arm. The parasite relies on Shinichi for survival, and it turns out Shinichi needs the parasite to fight against the other parasitic aliens that want him dead. Foe becomes friend as these two figure out how to live together.

Shinichi finds himself with strange powers.

This parasite first appeared as a dog.