Samus Aran first encounters the Namihe while running through the corridors of the Biosphere; however, it does not attack her but merely rushes through the corridor, forcing Samus to dodge it. She later fights both worms in the Subterranean Control Room. Both of the creatures are identical (save for their eyes) and have the same attack patterns: they will stick their heads out of holes in the walls and ceiling and fire energy bombs at Samus (reminiscent of their species' 2D appearances).
Samus must target each creature's head in Search View and stun it with a Missile. This will make the creatures come out of the wall and attack Samus more directly. At this point, the two worms are capable of temporarily entering a state in which they can absorb any of Samus' beam shots; once they've absorbed enough, they use the beam's energy to strengthen their projectiles, resulting in a single blast that launches a spread of multiple energy bombs. Fune and Namihe also have another attack which involves swallowing Samus and then spitting her out again. In order to defeat the two worms, Samus must first stun them with a Charge Beam shot then finish them off with a Lethal Strike or with another attack. Alternatively, she can use Missiles, but this will only damage the creature and won't leave it open to Lethal Strike, so it's less effective. After one is defeated, the other one becomes more difficult to battle. For example, the creature will not remain open to a Lethal Strike for as long the other one was, and it will be more difficult to pull out of the wall as it moves faster.
If Samus takes too long to kill the creature after being pried out, it will go back in the wall.
Chronologically, these two creatures are their respective species' first appearance since the destruction of planet Zebes. Unlike the Namihes and Funes originally featured on the planet, which were seemingly passive predators, this particular duo are extremely aggressive and can extend their bodies as well as move around their environment rather than staying nestled within a wall. These changes may be due to genetic manipulation by the Galactic Federation, but their aggressive behavior is more likely the result of either the aggravating cries of the infant Ridley or MB controlling them with her brainwaves.
- Metroid: Other M is the first game where the Fune and Namihe appear as bosses instead of common enemies.
- The Fune and Namihe's appearance and battle tactics are very similar to the Bomb Guardian from Metroid Prime 2: Echoes; all three are worm-like creatures that use energy bombs to attack Samus.
- It is unknown whether there were other Funes and Namihes within the BOTTLE SHIP. The presence of X Parasite-infected and/or mimicked versions of these two species in Metroid Fusion, which chronologically takes place after Other M, suggests there initially were others of their kind either aboard the BOTTLE SHIP or, most likely, in the Biologic Space Laboratories research station featured in Fusion. This theory is supported by the Fune-X and Namihe-X in the latter game that share the extendable, worm-like bodies seen in the creatures from the BOTTLE SHIP.
- Though brown ingame, the Fune and Namihe are depicted with their green and purple color schemes from Metroid Fusion in concept art.
- The Sandfang later on in the game is similar to the Fune and Namihe.
- The names "Namihe" and "Fune" are likely references to a couple in the popular Japanese manga and show, Sazae-san, who are also named Namihe and Fune.