Aker was first depicted as the torso of a recumbent lion with a widely opened mouth. Later, he was depicted as two recumbent lion torsos merged with each other and still looking away from each other.

From Middle Kingdom onwards Aker appears as a pair of twin lions, one named Duaj (meaning "yesterday") and the other Sefer (meaning "tomorrow"). Aker was thus often titled "He who's looking forward and behind". When depicted as a lion pair, a hieroglyphic sign for "horizon" (two merged mountains) and a sun disc was put between the lions; the lions were sitting back-on-back.

In later times, Aker can also appear as two merged torsos of recumbent sphinxes with human heads.

Aker was first described as one of the earth gods guarding the "gate to the yonder site". He protected the deceased king against the three demonic snakes Hemtet, Iqeru and Jagw. By "encircling" (i.e. interring) the deceased king, Aker sealed the deceased away from the poisonous breath of the snake demons. Another earth deity, who joined and promoted Aker's work, was Geb. Thus, Aker was connected with Geb. In other spells and prayers, Aker is connected with Seth and even determined with the Set animal. This is interesting, because Seth is described as a wind deity, not as an earth deity.

In the famous Coffin Texts of Middle Kingdom period, Aker replaces the god Kherty, becoming now the "ferryman of Ra in his nocturnal bark". Aker protects the sun god during his nocturnal travelling through the underworld caverns. In the famous Book of the Dead, Aker also "gives birth" to the god Khepri, the young, rising sun in shape of a scarab beetle, after Aker has carried Khepri's sarcophagus safely through the underworld caverns. In other underworld scenes, Aker carries the nocturnal bark of Ra. During his journey, in which Aker is asked to hide the body of the dead Osiris beneath his womb, Aker is protected by the god Geb.

In several inscriptions, wall paintings and reliefs, Aker was connected to the horizon of the North and the West, forming a mythological bridge between the two horizons with his body. Certain sarcophagus texts from the tombs of Ramesses IV, Djedkhonsuiusankh and Pediamenopet describe how the sun god Ra travels through the underworld "like Apophis going through the belly of Aker after Apophis was cut by Seth". In this case, Aker seems to be some kind of representation of the underworld itself.

Aker appears for the first time during the 1st Dynasty with the kings (pharaohs) Hor Aha and Djer. An unfinished decorative palette from the tomb of Djer at Abydos shows Aker devouring three hearts. The location of Aker's main cult center is unknown, though. His mythological role was fully described for the first time in the famous Pyramid Texts of king Teti.

In Greek mythology, Persephone (/pərˈsɛfəniː/ pər-SEF-ə-nee; Greek: Περσεφόνη, romanized: Persephónē), also called Kore or Kora (/ˈkɔːriː/ KOR-ee; Greek: Κόρη, romanized: Kórē, lit. 'the maiden'), is the daughter of Zeus and Demeter. She became the queen of the underworld after her abduction by Hades, the god of the underworld, with the approval of her father, Zeus.The myth of her abduction and return to the surface represents her functions as the embodiment of spring and the personification of vegetation, which sprouts from the earth in spring and disappears into the earth after harvest. In Classical Greek art, Persephone is invariably portrayed robed, often carrying a sheaf of grain. She may appear as a mystical divinity with a sceptre and a little box, but she was mostly represented in the process of being carried off by Hades.

Persephone as a vegetation goddess and her mother Demeter were the central figures of the Eleusinian mysteries, which promised the initiated a more enjoyable prospect after death. The origins of her cult are uncertain, but it was based on ancient agrarian cults of agricultural communities. To her alone were dedicated the mysteries celebrated at Athens in the month of Anthesterion.

Her name has numerous historical variants. These include Persephassa (Περσεφάσσα) and Persephatta (Περσεφάττα). In Latin, her name is rendered Proserpina. She was identified by the Romans as the Italic goddess Libera, who was conflated with Prosperina. Myths similar to Persephone's descent and return to earth also appear in the cults of male gods like Attis, Adonis, and Osiris, and in Minoan Crete.