Tartarus.

Tartarus (Τάρταρος) was a place in the underworld in Greek myths and legends. This was a dark place. A layer of darkness of the god Erebus covered Tartarus.

There were many different monsters including Cyclops.

Chaos.

Chaos (χάος) is an original state of the world. There are myths and legends about this condition.

Eros, Gaia, Erebus (Ἔρεβος), Tartarus (Τάρταρος), Nyx, Uranus are gods and goddesses who had relation to Chaos.

Eros.

 Eros (Ἔρως) was a god of love in ancient Greece. His father was Hermes (Ἑρμῆς) or Zephyrus (Ζέφυρος). His mother was Aphrodite, goddess of love and beauty. Or Iris (Ἶρις), goddess of the rainbow. Also, Eros had several siblings: Gaia (Γαῖα), Nyx (Νῠ́ξ), Erebus (Ἔρεβος,), and etc.

His symbols were bow and arrows. Eros was known as Aphrodite's assistant.

Eros looks like a young man with two wings on the back. He helped people to find their true love.

In Greek mythology there are many different legends about this god. One of them is a love story. This myth about Eros and Psyche.

The young Psyche was very beautiful. So, everyone forgot about Aphrodite. She became evil. Aphrodite wanted to hurt her.

Psyche became unhappy. Because Aphrodite gave her difficult tasks. Psyche should have gotten the Golden Fleece, she had to bring Persephone's box from the underworld, and she had to get water from the river Styx (Στύξ). Psyche did it all with the help from others.

Later Eros and Psyche got married. There are many versions of their story. 

He had relations with other gods and goddesses, such as: Chaos (χάος,), Themis (Θέμις), Ares (Ἄρης,), Hephaestus (Ἥφαιστος), Zeus (Ζεύς), Cronus (Κρόνος), and etc.

There are different paintings and statues of Eros. 

Eris.

Eris (Ἔριδα) was a goddess of discord and strife in Ancient Greece. Her parents were Zeus and Nyx or Erebus and Hera. Also, she had many siblings among other gods and goddesses. Aphrodite, Hermes, Ares, Athena, Heracles, and ect. were all her relatives.

Eris had her own symbol. She was known for her Golden Apple of Discord. Eris gave her symbol during Peleus and Thetis wedding. So, Athena, Aphrodite, and Hera became angry. After this event the Trojan War started.

Eris had several children.

There are many paintings and statues of this goddess.

Hypnos.

Hypnos (Ὕπνος,) was a god of sleep in Ancient Greece. His father was Erebus, god of darkness, his mother was Nyx, goddess of night. Also, Hypnos had severa siblings, such as: Thanatos, Nemesis, Keres, and etc.

His symbols were poppy and Cottonwood. Hypnos lived in the underworld. His spouse was Pasithea. They had several children. Morpheus was a relative of Hypnos.

In Greek mythology there are many myths and legends about this god. Artists and sculptors created different paintings and statues of a Greek god of sleep.

Source of image:

https://www.shutterstock.com/es/image-vector/hypnos-thanatos-twin-greek-mythology-gods-1296793756



Source of image:

https://www.shutterstock.com/es/image-vector/hypnos-vintage-engraved-illustration-drawing-1446915428



Source of image:

https://www.shutterstock.com/es/image-photo/floor-mosaic-colored-stones-god-sleep-1188002947