Technically, the Furies are children of Uranus and Gaia, the gods of heaven and Earth. The Furies were often draped in black, with wings and snakes for hair. They were a terrifying sight to behold and meant that severe punishment was coming.
Like gorgons, the hair of the Furies was made up of coiling snakes. For weapons, the Furies carried whips, but they also had the supernatural ability to instill madness and rage in their enemies.
Their appearance is described by Aeschylus as Gorgo-like, their bodies covered with black, serpents twined in their hair, and blood dripping from their eyes; Euripides and other later poets describe them as winged beings. (Orest. 317, Iphig.
According to the Greek poet Hesiod, they were the daughters of Gaea (Earth) and sprang from the blood of her mutilated spouse Uranus. In the plays of Aeschylus, they were the daughters of Nyx; in those of Sophocles, they were the daughters of Darkness and of Gaea.
They lived in the underworld and ascended to Earth to pursue and torment the wicked. They are depicted as having snakes for hair and as weeping human blood. The name of the Furies comes from the Latin word Furiae.
In one story, the Furies are born from the blood of Uranus, the ancient god of the sky, and Gaea, or mother Earth, after Uranus's death. In other stories, they are the children of Gaea and Darkness.
The Furies muttered in their sleep, and the ghost of Clytemnestra redoubled her efforts to wake them, until finally, they began opening their eyes. They looked around for Orestes, saying, all at once, “Get him, get him, get him, get him[!]” (236).
The pale white bodies of Light Furies allow them to easily blend in with clouds and the sky at daytime in a similar way that Night Furies blend in with the night sky.
The male and female Light Furies look the same, but males are bigger and a bit bulkier. The shape of its tail and ears look off because they are in motion. Technically, in the HTTYD world, there is no real physical difference between males and females except maybe for males being a bit bulkier like Thorndrum said.
Powers & Abilities
Immortality - The Furies are older than the Earth itself and like the Olympians and Titans, are immortal; yet can still be killed by the same circumstances; either by a god or a god's weapon.
They were generally depicted as birds with the heads of maidens, faces pale with hunger and long claws on their hands. Roman and Byzantine writers detailed their ugliness. Pottery art depicting the harpies featured beautiful women with wings.
They had the bodies and faces of twisted old women, with writhing snakes for hair, runny eyes, and tattered black clothing. They punished their victims with a wild paralytic song that aroused intense feelings of guilt and remorse—essentially, the Furies drove criminals mad by exposing them to their own guilt and fear.
The Eumenides, or the Furies, were the Greek deities of divine vengeance and retribution. Because they were so terrifying, the Greeks sometimes referred to them as “The Kindly Ones,” not wanting to mention their names directly.
The Roman goddesses of vengeance, the Furies lived in the underworld, where they tortured sinners. The children of Gaea and Uranus, they were usually characterized as three sisters: Alecto (“unceasing”), Tisiphone (“avenging murder”), and Megaera (“grudging”). Their counterparts in Greek mythology are the Erinyes.
Fates And Furies is the story of a marriage. Not of every marriage (as so many of today's novels-about-marriage attempt to be), but just about the one — Lotto and Mathilde. It is a split narrative, first Lotto's version of events (Fates), then Mathilde's (Furies).
Night Furies don't have sharp spikes or spines, instead, they have short and thin fin-like spines that prevent greater air resistance. This gives the Night Fury a huge advantage in high-speed flight.
In the books, Luna is given her name because she glows like the light of the moon. As described on p. 92 of How to Fight a Dragon's Fury, “…the Dragon Furious called his second-in-command to him, a luminously beautiful Seadragon slightly smaller than himself, known as Luna.
Just overall, the Night Fury would win hands down.
Toothless and Light Fury's Relationship is one of the strongest romantic relationship between dragons seen in the franchise.
Jaws. Night Furies have high jaw strength. They can also retract their teeth, to avoid chipping and breaking when not in use. The ability to retract his teeth is what earned Toothless his name.
Night Furies are also the rarest of all dragons; They have been hunted by the dreaded dragon hunter Grimmel the Grisly to near-extinction. Only Toothless remains the last of his kind.
She promises to give the Furies a home in Athens, where they will be honored as divinities. But, in return, they must promise not to destroy the Athenians' crops, and so on. Then Athena repeats her promise to make the Furies goddesses in Athens.
Apollo enters again and orders the Furies to leave his temple at once lest he set loose the power of his sacred arrows against them. He warns that his temple is too holy a place for them to defile by their presence and says that their rightful place is wherever blood is being shed and people are suffering.