Night Fury
The night fury is never seen until Hiccup shoots one down. They have black scales and green eyes (as far as we know). Since Toothless (see top right) is the last night fury we don’t know whether or not they all have green eyes. We find later in the series that night furies also have lightning. They are mysterious and never miss their targets. We find out in the third movie, How to Train Your Dragon The Hidden World, that Toothless is the last night fury. Toothless has his life saved many times by a Viking named Hiccup Horrendous Haddock. In order to not go extinct Toothless ended up mating with a Light fury (see middle right). They have three baby dragons (dragonets) called night lights (see bottom right). It all night lights are exactly like this although they are all black and white and have either green eyes or blue eyes. I know that the title says night fury but I’m gonna throw some light fury and night lights in here too.
Light fury
As far as we know the only light fury we see doesn’t have a name but I’m going to call her Star because it’s a real hassle to write light fury every single time. Throughout the whole entire series we only see one light fury. Why is that? I have no clue. Some think that Star is the last of her kind but it never says that. All we know is that they are very rare. That might be why we only see one or it’s just that she has the same scenario that Toothless has going on. We meet the light fury’s in a clearing on Berk (I think). And then we see her dotted throughout the movie as they travel to the hidden world. She doesn’t trust humans until Hiccup saves her. Some believe that that is because humans killed her species and she escaped.
Night lights
Night lights are the children of Toothless and Star. Their names are Dart, Pouncer, and Ruffrunner (seen bottom right). I don’t know when they were officially named but those are their names if you don’t believe me ask google. I believe that these are the only dragons left related to night furies and light furies. In Dragons: The Nine Realms we don’t see any night furies or light furies only night lights. That also goes to show that Star might’ve been the last Light Fury. We also see that like Toothless Night Lights have lightning and like Star they can turn invisible. We don’t know this for sure because Thunder is the only night light that we see use these powers. If I’m mistaken please correct me. That’s about all I know I hope this was helpful.
P.S If you have anything to add or change please do but make sure it’s correct.