Another possibility is that he could be the brother of Weiss. Weiss comes from a wealthy and proper family. Naruto's more free - spirited and unorthodox ways would clash with Weiss's upbringing at first, but they could grow to understand and support each other as the story progresses.
Well, it could be about Naruto somehow being related to a character in RWBY and their adventures together. Maybe Naruto's skills and values from his own world get incorporated into the RWBY universe, like his ninja techniques being used to fight Grimm.
It could be an unknown brother that was kept secret all this time. Maybe he was hidden away by some enemy of the village and trained to be a powerful adversary for Naruto.
Perhaps Naruto's brother could be a long - lost relative from a far - flung part of the ninja world. He could have been separated from Naruto when they were young due to a war or some political intrigue in the ninja clans.
The older brother in the fanfiction might be a character with a tragic past. For example, he could have been experimented on by Orochimaru and gained some strange powers as a result. And he returns to the village later to protect Naruto from the threats that are coming towards him.
In a Naruto and RWBY crossover fanfiction where Naruto has a Roman - like brother, the brother might be skilled in thievery or con - artistry, skills that are quite different from Naruto's ninja skills. This could lead to all sorts of comical or tense situations. For example, the brother might try to steal from the wrong person in the Naruto universe and Naruto has to bail him out. Or he could use his wits to help Naruto in some unexpected ways during a battle.
His brother could be an unknown Uzumaki. Since Naruto is from the Uzumaki clan, it would make sense for his brother to be from the same clan. Maybe he was hidden away for some reason, like to protect him from the same threats that Naruto faced as a child.
Yes, there might be. There are numerous fanfictions out there that combine different fandoms in creative ways. However, finding a specific one about 'Naruto Roman's Brother' in the RWBY universe would require some digging through fanfiction platforms. You could start by looking on popular sites like Archive of Our Own or Fanfiction.net.
The half - brother could be developed as a character with a troubled past. He might have been ostracized in his own community because of his relation to Naruto or his own unique abilities. This could make him initially cold and distant but as he interacts with Naruto, he could gradually open up and become more warm - hearted.
It could be a group of rogue ninjas from Naruto's world who have found a way to cross over to Korra's world and cause chaos. They might want to steal the bending abilities for their own evil purposes.
It could be a powerful ninja - demon hybrid. This antagonist could be jealous of the bond between Naruto and Inuyasha. He wants to use their combined power for his own evil purposes. So, he tries to turn them against each other first by spreading false rumors and then by attacking their loved ones.