Construction
The Night Lights are the hybrid children of a Night Fury and a Light Fury. The first known Night Lights were Toothless and Light Fury's children, Dart, Pouncer and Ruffrunner. By Dragons: The Nine Realms, Toothless and the Light Fury's descendants had expanded to Thunder and his family consisting of his parents and his younger siblings, Shadow, Goggles (gender currently unknown), and Splattertail (gender currently unknown).
History[]
Known Night Lights[]
Dart[]

Dart is the daughter of Toothless and the Light Fury and the sister of Pouncer and Ruffrunner.
Pouncer[]
Ruffrunner[]
Thunder[]

Thunder is the dragon protagonist of Dragons: The Nine Realms. He is of the Night Light species and the dragon companion and best friend of Tom Kullersen. Thunder is a direct descendant of Toothless (the dragon companion of Hiccup Horrendous Haddock III), the Light Fury, and the Night Light Hatchlings.
Having been separated from his fellow Night Lights, Thunder wandered the Hidden World as a lone dragon, until the Kullersen Fissure caused an opening to the Hidden World, allowing him to escape into the outside world. During this time, an Earthquake trapped Thunder under a large number of boulders until he was rescued by the human Tom Kullersen leading to the two forming a close bond and eventually becoming best friends. Their relationship later resembled their ancestors, Hiccup and Toothless.
As time passes, Tom becomes Thunder's rider as they work with their fellow Dragon Club members to guard the secret of the Hidden World from humans who may pose a threat to the dragons.
Shadow[]

Shadow is the younger brother of Thunder and the brother of Goggles and Splattertail. However, it is currently unknown what gender his other siblings are.
Elder Night Light[]

The Elder Night Light is a male Night Light who appears in the series Dragons: The Nine Realms. He is the leader of Thunder's clan and respected by all in his community. He is the father of Father Night Light and the grandfather of Thunder and his siblings.
He was very hostile towards strangers, whether they were human or dragon. He also blamed Tom for unintentionally bringing two Snow Wraiths to his clan. However, he noticed Tom and Thunder's deep friendship and assisted them in defeating the Snow Wraiths. The Elder let Tom ride him and let Thunder stay with his human best friend.
In the series finale, the Elder Night Light is killed in a battle between the Dragon Club and the Jörmungandr, leading Thunder to become the new Elder.
Father Night Light[]

Father Night Light first appeared in the episode "The Night Lights, Part 1".
He is the mate of an unnamed female, the father of Thunder, Goggles, Splattertail, and Shadow and the direct descendant of Toothless and the Light Fury. Before the series, his eldest son got separated after being driven away by a Titan Wing Skrill, hence the scar on his left shoulder. He and his mate were both hostile towards the humans at first until they saw his son's relationship with the other Dragon Riders.
Mother Night Light[]

Mother Night Light is the mother of Thunder, Goggles, Shadow, and Spattertail, the wife of an unnamed Male and the descendant of Toothless and Light Fury.
Before the series, Mother Night Light lost her eldest son after he was separated from her after being driven away by a Titan Wing Skrill. They were eventually reunited. However Mother and Father Night Fury were both hostile towards the humans at first until she saw her son's relationship with Tom and the other Dragon Riders.
She currently lives in the King's realm with the rest of her family.
Goggles[]

Goggles is the sibling of Shadow, Thunder and Splattertail, the child of the Father Night Light and Mother Night Light and a direct descendant of Toothless and the Light Fury. His or her gender is currently unknown.
Goggles first appeared in the episode "The Night Lights, Part 1".
Splattertail[]

Splattertail is the sibling of Thunder, Goggles, and Shadow, the child of the Father Night Light and Mother Night Light and a direct descendant of Toothless and the Light Fury
Splattertail first appeared in the episode "The Night Lights, Part 1".