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."
Spider (pulp fiction)
Despite The Spider's tendency to kill his enemies, he encounters several foes more than once, such as The Fly and MUNRO, a master of disguise. Some storylines featuring a struggle against a single villain lasted for several consecutive issues, such as The Spider's four-part battle against The Living Pharaoh and The Spider's three-part battle against The Master and his Black Police. Among the enemies he encountered just once were predecessors of the costumed super villains of comic books, such as Judge Torture, Red Feather, The Bloody Serpent, The Brain, The Emperor of Vermin, The Red Mandarin, The Silencer, and The Wreck. The names of two Spider villains, The Bat Man and The Iron Man, were later adopted for DC and Marvel comic book superheroes.