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|did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about on the following wiki(s):|
|First Appearance||Metroid (1986)|
|Latest Appearance||Super Smash Bros. for Wii U (2014)|
The Metroid were originally used as bioweapons by the Space Pirates as they feed on "life energy" of their prey. Metroids leave all the prey's blood and organs intact, but leaves them without the energy necessary to contain life.
The Metroids were long rumored to be created by an ancient race, eventually being revealed that it was the Chozo who genetically engineered the species. They were created in order to prevent the spread of the more dangerous X Parasites.
The body of a typical Metroid consists of a thick gelatinous membrane like a jellyfish. Inside the membrane is a set of three to four red, raspberry-shaped, quadripartite/tripartite nuclei.
They have two pairs of mandibles, one for gripping their prey and the other for extracting its life energy. It is explained that Metroid hover in the air due to the use of kinetic energy stored in their bodies, allowing them to defy gravity.
- The life energy that Metroid feed off of has never been fully disclosed, however has been theorized to be Mana, an incorporeal life energy believed to be possessed by all living beings.