Geron

This article's name is an official translation from official Japanese media.

The Geron appear in Metroid Fusion. They appear to be some sort of X biomass, but have visual characteristics like that of a Kago. They do not attack, but often obstruct certain areas and serve as a nuisance to Samus, sometimes forcing her to take a longer route to an objective. Different weapons are required to destroy different types of Geron, but all can be destroyed instantly with the Screw Attack.

Metroid Fusion manual
"Hatch-blocking enemies

Destroy hatch-blocking enemies with Missiles."

Types

 * Green - Takes three standard Missiles to destroy. Primarily appears in Sector 2.
 * Blue - Takes three Super Missiles or two Diffusion Missiles to destroy. Primarily appears in Sector 3.
 * Silver - Takes one Power Bomb to destroy. Primarily appears in Sector 5.

Trivia

 * Geron variants tend to get stronger as the game progresses. Adam Malkovich takes note of this when Silver Geron begin to appear: "Samus, I think they are evolving, growing stronger. Some are now appearing that resist your current weapons."
 * When the water level in Sector 4 is lowered, it is possible to see a blue Geron relatively early. To do this, Samus must run into the room before the Data Room, and go through the opening in the bottom left corner. An X will form into a blue Geron in the next room, though Samus can run past it while it forms.
 * If the player progresses into the game far enough without destroying the first green bio-wall on the Main Deck, it will disappear.
 * The silver Geron periodically shake and generate a sound that can be heard even when it is off-screen.
 * They seem to be an X mimic of the Zebesian Bio-Barriers.

Gallery
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