Annabeth (alexandra daddario) is the daughter of Athena, a goddess in Greek mythology, and a mortal. Because the hybrid can't see her parents, Annabeth has never seen Athena, but there is subtle interaction between her and her mother, and sometimes she hears Athena speak.
Grover (Brandon T. Jackson) Grover is a mythical creature called Goat Man (half man and half sheep), which is related to Fornas in Roman mythology. He is Percy Jackson's best friend and is responsible for protecting Percy's safety during his transcontinental adventure.
Long Xing Centauri (pierce brosnan) is a professor on the surface, but in another world he becomes a centaur. Unlike other centaurs, Kay Long Xing is famous for her kindness and wisdom. He was the mentor of many Greek heroes, including theseus and Achilles.
Medusa (uma thurman), a beauty with snake hair, used to be very beautiful, but she thought she was good-looking, and compared herself with the goddess of wisdom, which angered Athena. She used magic to turn Medusa's hair into countless poisonous snakes and beautiful women into monsters. What is more frightening is that her eyes are shining with terrible light, and anyone who looks at her will turn to stone.
Zeus (sean bean) Zeus, the god in Greek mythology, is the supreme ruler of Mount Olympus. Many gods of Olympus, many heroes of Greece, were born to different women. He used lightning as a weapon to maintain the order of heaven and earth, and bulls and eagles were his symbols.
Poseidon (Kevin McKidd) Poseidon is the son of Cronus and Rhea, the younger brother of Zeus, second only to Zeus, and one of the twelve gods in Greek mythology. After the war with Titan, Poseidon became a great and majestic sea king, in charge of all the waters around the mainland.
Hades (steve coogan) Hades is the brother of Zeus, Poseidon and Demeter, the kings of gods. He is the eldest son of Cronus and Rhea, the second generation gods. After defeating his father Cronus, he and his younger brothers drew lots to distribute the world, and he was drawn to the underworld, thus becoming the ruler of the underworld, namely Pluto.
Athena (melina kanakaredes) Athena is one of the twelve gods of Olympus in Greece. In ancient mythology, she was the master of dark clouds and thunder, and the protector of peaceful labor. She teaches people to domesticate cows and horses, and to make cars and boats. She gave the world plows and rakes, spindles and looms, so she was regarded as the protector of women's labor, especially knitting technology.
Persephone (Rosario Dawson) Persephone is the queen of the underworld in Greek mythology. She is the daughter of Demeter and Zeus. She was kidnapped by Hades and married to Hades in the underworld, that is, to her uncle.