Ridley (Metroid)
One of Adam's final missions to Samus is to finish off Ridley, whom Adam fears might be more dangerous than the Metroids if left unchecked, and claims Samus is the only one capable of stopping him. However, Samus later discovers his corpse after he is killed, having had his energy drained by the Queen Metroid on the Bottle Ship. His mummified corpse turns up again in "Metroid Fusion" on the BSL station, after having apparently been removed from the Bottle Ship by the Galactic Federation and placed in a sub-zero storage room for further research (potentially into further bioweapon applications). It is later infected by an X Parasite, allowing it to gain the ability to transform into Ridley's likeness, known as . Samus later defeats the Ridley mimic and absorbs its Core-X, regaining her signature Screw Attack. What was left of the cloned Ridley's remains were destroyed along with the X when the BSL station crashed into SR388.
Characters in the Metroid series
The heavy trauma of having Madeline rejecting her safety and finding out that the Galactic Federation actually created her for military purposes caused a meltdown in her mind and she decided to take judgement on humanity for their misdeeds, forcing the Bottle Ship in a collision course. Melissa was confronted by both Samus and Madeline after her Queen Metroid had been killed. Although both of them tried to persuade her, she did not listen and tried to kill Madeline, only to get shot down by the Marines under the Federation colonel's orders.