In fanfiction, the chained blades could have various origins. One possibility is that they are a family heirloom that Naruto discovers. Maybe they were passed down from an unknown branch of his family. Another idea is that he finds them during a mission in some ancient ruins. The blades could be tied to a long - forgotten ninja clan that once had great power.
The origin of Naruto's chained blades in fanfiction could be something very mystical. For example, they could be a gift from a powerful spirit that Naruto encounters. This spirit sees potential in Naruto and bestows the blades upon him. Or perhaps the blades are the result of a powerful ninja's experiment long ago. They were created with a combination of rare materials and powerful jutsu, and Naruto stumbles upon them by chance in a hidden laboratory.
Well, in fanfiction, the chained blades could be of extraterrestrial origin. Maybe some aliens visited the ninja world long ago and left behind these blades. Naruto, being in the right place at the right time, discovers them. Another origin could be that they are created by a group of rogue ninjas who were trying to make a weapon to overthrow the existing ninja system. Naruto then gets hold of these blades, either by defeating the rogues or finding them abandoned.
The presence of chained blades in Naruto's arsenal in fanfiction would likely lead to a shift in his character development. He'd have to learn new skills related to the blades, like how to control the chains precisely. This could add a new layer of discipline to his character. Also, the way other characters perceive him might change. They might see him as more of a warrior or a threat. In terms of the story's plot, it could open up new story arcs. For example, he might go on a journey to find the best way to master the chained blades or to find a special material to upgrade them.
One possible origin could be a long - lost kekkei genkai. Maybe Naruto's family had a secret bloodline ability that was suppressed for generations, and now it resurfaces as the red chakra.
It could be due to a unique training method. In fanfiction, perhaps Naruto discovered a new way to purify his chakra through intense meditation or some sort of elemental training that no one else has tried before.
One possible origin could be a secret scroll he finds. Maybe it was hidden by an ancient shinobi who had the power to summon ravens, and Naruto stumbles upon it during one of his adventures.
One possible origin could be a new type of training he undertakes. Maybe he discovers a hidden scroll that teaches him a unique form of physical conditioning that gives him super strength.
It could be from some sort of ancient ninja training that was lost and he somehow discovers it. Maybe there's a hidden scroll or a hermit who teaches him this fire - controlling ability.
The origin of Naruto's starfire powers in fanfiction might be due to an experiment. Some rogue ninja or a secret organization could have been conducting experiments with celestial energy. Naruto somehow gets caught in one of these experiments and as a result, he gains the starfire powers. Another possibility is that it's a gift from the stars themselves. Naruto has always been a special character, and the stars, seeing his potential and pure heart, decide to grant him these powers to help him on his journey.
One possible origin could be some kind of ancient bloodline. Maybe Naruto has a hidden bloodline that was passed down through generations and finally awakened, allowing him to summon angels. Another option is that he got this ability through a special training or a quest. He might have found a hidden place or an old sage who taught him the art of summoning angels.
One possibility is that he inherits it through some sort of bloodline connection that was previously unknown. Maybe there's a distant relative who had the ability to control sand, and it somehow got passed down to Naruto.
One possibility could be some sort of new training he undergoes. Maybe he discovers a hidden jutsu scroll that teaches him how to control and produce fire from within his body. This could be a long - lost technique from an ancient ninja clan.