There is a chance that it's a dark sorcerer. The sorcerer might need something from the archer's family, like a special amulet or a unique bloodline. So he captures them, and the archer has to face this sorcerer to free his family.
It could be a rival archer who has a vendetta against the main archer and decides to target his family to get back at him.
Perhaps the family is kidnapped by an evil wizard. The archer embarks on a dangerous journey to the wizard's lair. Along the way, he overcomes various obstacles with his wits and archery. Once there, he battles the wizard and manages to rescue his family.
In this type of fanfic, Archer might use his unique skills and abilities to save his family. Maybe he has his signature archery skills that he utilizes to fend off threats. For example, he could be facing a horde of magical creatures and his precise shots are the only thing standing between his family and danger.
It could be a new, self - made villain. Maybe a rogue ninja who was once rejected by the Hidden Leaf Village. He blames Naruto for his misfortunes and decides to target his sister as revenge. This villain would have his own set of unique and dangerous jutsu, which Naruto would have to figure out how to counter in order to save his sister.
Maybe Kabuto. He's a sly character who often works for the more powerful villains. He could be sent to capture Naruto's younger self for some experiment or to gain information. Naruto would need to fight against Kabuto's medical ninjutsu and his sneaky tactics to save his younger self.
Archer could develop from being a simple family - man to a fearless protector. His archery skills would become more refined as he faces greater challenges to save his family. For Arturia, she might develop a deeper understanding of human emotions and family bonds as she helps Archer. She could start to see the importance of family in a different light compared to her own experiences.
Perhaps in this fanfic, Archer's family is cursed. Archer, with his archery, has to go on a quest to find a way to break the curse. Arturia could join him on this journey. She might have some knowledge of magic or ancient spells that could be related to the curse. Along the way, they face many challenges and Archer uses his archery to fight off various threats to his family.
Perhaps the main antagonist could be a new character. This new character could be an ancient evil that has been awakened by the presence of the Saiyans on Earth. They see Bardock and Raditz as a threat to their plans of taking over the universe and thus try to eliminate them.
It could be a rogue ninja from the Hidden Leaf's past who has come back for revenge. Maybe someone who was wronged by the village long ago and has now amassed great power to destroy it. Another possibility is a new enemy from outside the village, like a powerful warlord from a far - off land who wants to conquer the Hidden Leaf for its resources.
It could be that Archer's loss of an arm makes him more determined. He might start to train harder with his remaining abilities, and in the process, discover new skills. This could also make him more respected among his comrades. Arturia, on the other hand, might start to see Archer in a new light, not just as a fellow fighter but as someone she deeply cares about on an emotional level.
It could be a rival family who had some sort of long - standing feud with Sakura's family. They might have caused their deaths in an underhanded way and now Sakura has to deal with them as she tries to uncover the truth.