Ridley has appeared in all but five Metroid games - Metroid II: Return of Samus, Metroid Prime 2: Echoes, Metroid Prime Hunters, Metroid Prime: Federation Force and Metroid Dread. Ridley was apparently capable of healing his wounds by eating human flesh, as illustrated in the manga when he claimed that he survived the destruction of his flagship by consuming the bodies of the dead humans in K-2L. The manga also revealed that Ridley is extremely adept at survival. In most games in which he appears, he has been the penultimate or ante-penultimate boss.

Strangely, some of his prior battles ended with his body seemingly exploding, but in-game lore states he survived these violent defeats until Super Metroid. Though Ridley often appears in different forms, it is clarified through scans in the Metroid Prime series, as well as events portrayed in Metroid: Other M, that every one of his incarnations chronologically seen prior to Other M and Metroid Fusion are indeed the same individual (the exception being the Ridley Robot), despite his numerous defeats. He was also apparently capable of building a robot in his own likeness. Despite his bestial appearance, Ridley is known to be highly intelligent and even capable of speech in the Magazine Z manga. Resembling an emaciated pterodactyl-dragon with glowing eyes, the true name of Ridley's species is unknown.

As such, the Space Pirate leader is fittingly referred to as the Cunning God of Death ( 狡猾の死神 ?) in his Zero Mission official art on the Japanese website. But Ridley's brutality is matched only by his resilience, and he regularly returns from apparent death to do battle with Samus once more.

Since then, he and Samus have clashed several times, with Samus usually emerging the victor. Sadistic and bloodthirsty, Ridley delights in death and destruction, and was responsible for the massacre of the colony K-2L.

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