Its exact origins are unknown due to multiple different stories of how it came be, but with each origin, it turns more heinous than the last... Its name is Phantoon, the first spirit/supernatural enemy in the Metroid timeline.
Original Origin: Phantoon was borne in the vessel that the Chozo had arrived in Zebes. Its "mother" was Mother Brain's evil soul, which Phantoon had became a manifestation of.
English Origin: Phantoon is a Space Pirate General that had joined the pirates because Mother Brain's brainwaves were so vile that it became an incredible food source for Phantoon.
Other M Origin: The Phantoon that is fought by Samus is merely a fraction of what the third dimension can hold. Apparently, Phantoon can also ascend to higher dimensions using an organ in its brain. It was brought to Zebes by the ancient Chozo, through their crashed vessel.
Powers and Stats
Tier: 5-B | Unknown
Origin: Super Metroid
Classification: Manifestation of the Evil of Motherbrain (If going by original Japanese backstory), a space pirate general that feeds of brainwaves (If going by English backstory), a higher-dimensional eldritch abomination (If going by Other M storyline)
Powers and Abilities: Superhuman Physical Characteristics, Fire Manipulation, Invisibility, Intangibility (Spatial), Flight, Resurrection of the Dead (Also converts them into creatures), Energy Absorption, Monsters Summoning, Monster Mind Manipulation
Attack Potency: Planet level (Can compete with Samus and her Varia Suit equipped with power bombs) | Unknown (The complete body of Phantoon is never shown in game, furthermore Phantoon being higher dimensional is contradictory to the showings in Metroid (See Note))
Lifting Strength: Unknown (Has had part of its body manifest in Zebe's 960x gravity, but it is unknown whether that is anywhere its maximum lifting strength)
Stamina: Very High (Went all the way from Zebes to the Bottle Ship when it sensed MB's brainwaves)
Range: Hundreds of meters
Standard Equipment: Unknown
Key: Head | Full Body
Note: Due to constant switching between backstories, it deemed best not to include any mention of the Other M backstory in stats.