Ridley (Metroid)
Ridley's status within the ranks of the Space Pirates is unclear, with some sources stating that he is the leader of the entire Space Pirate race, whereas others portray him as simply the Pirates' military commander or even a mere enforcer within the Pirate military ranks, subservient to Mother Brain or Space Pirate High Command. Regardless, he is consistently depicted as a ruthless and cunning tactician who never passes up an opportunity to bring his considerable ferocity to bear on the battlefield, opting to overwhelm his opponents with an unwavering onslaught of attacks from his mouth, claws, and tail. He is also incredibly cruel, actively taking pleasure in the killing and torment of others; at one point in the official manga he taunts Samus by claiming he may have devoured her mother's corpse after killing her, and a Space Pirate log entry in "Metroid Prime" notes that being the mainstay of the Pirate security force is "a job he will certainly relish."
T.H.U.N.D.E.R. Agents
With the threat of the Subterraneans ended, new villains appeared in the original series. Issue #9 introduced S.P.I.D.E.R. (Secret People's International Directorate for Extralegal Revenue), the main villains for the rest of the series. Other menaces included the Iron Maiden, an armored mastermind (introduced in the first issue as a possible love interest for Dynamo) who worked for the Subterraneans; Andor, a fast-healing telekinetic superhuman created by the Subterraneans who was introduced in "Dynamo" #1; along with Red Star (Communist menace) and others.