For the banished mercenary, his character development can be made interesting by exploring his backstory. If he was banished because of a misunderstanding, gradually revealing the truth behind it can be a great way to develop his character. He might initially be a lone wolf, but as he gets involved in various adventures, he realizes the importance of having comrades. His views on the shinobi way could change over time. For instance, he might start off believing that only power matters but then, after seeing the selfless acts of others, he begins to understand the value of things like loyalty and friendship. This transformation from a jaded mercenary to someone with a more positive outlook on the shinobi world would be very engaging.
A possible plot could involve the banished mercenary being from a long - lost clan. The reason for his banishment was a false accusation by a rival clan. As he wanders the Naruto world as a mercenary, he discovers clues about his clan's true heritage and power. He then uses his skills as a mercenary to gather allies and resources to prove his clan's innocence and restore its honor. Along the way, he crosses paths with Naruto and his friends and they either help or hinder his quest depending on the situation.
It could be an original character. For example, a ninja who was born into a minor clan but had great potential. However, due to political intrigue and jealousy from a major clan, he was framed and banished. He then became a mercenary to survive. Another option could be a character who was once a part of a secret ninja organization and was banished when he disagreed with their methods. Now, as a mercenary, he returns to the Naruto world with a vendetta against those who wronged him.
One idea could be that the banished mercenary has unique jutsu skills learned from different lands during his mercenary days. He could return to the Naruto world with a new perspective and hidden motives, perhaps trying to unite different ninja clans against a new, greater threat. Another plot idea is that he has a connection to an ancient prophecy that was thought to be forgotten, and his banishment was actually part of a grand scheme to protect him until the time was right.
Well, his life changes in many ways. Firstly, he has to find his own clients as a mercenary, which is very different from his village - assigned missions. He probably has to travel to different regions and learn about new cultures. Also, without the village's resources, he has to take care of his own equipment and training. He may form alliances with other outcasts or mercenaries. And he might develop a more cynical view of the ninja world, since he was banished from the place he once called home.
He might take on rescue missions. For example, rescuing hostages from bandits or rogue ninjas. Since he has a strong sense of justice, he'd be drawn to such tasks. He could also be hired for protection missions, like guarding a caravan traveling through dangerous lands.
In 'banished Naruto fanfiction', Naruto often becomes more independent. Since he's away from the village that has both supported and shunned him, he has to rely on himself. This makes him grow up faster and become more strategic in his actions.
Maybe Shion had a vision that was misinterpreted. People in the village might think Naruto was a danger based on that, so they banish him.
Naruto would likely become more independent. Without the support of his parents, he has to fend for himself. He might develop a tougher exterior and be more cautious about trusting others. For example, he may not be as open - hearted as he was in the original story, always having the fear of being betrayed again in the back of his mind.
Naruto might also initially feel a sense of abandonment. However, his kind - hearted nature could lead him to try and see the good in the situation. He could start to explore the world outside, learning about different cultures and ninja techniques. He may use this experience to become more empathetic towards others who have also faced hardships, and in the long run, this banishment could be a turning point in his life to become an even greater ninja.
At first, Naruto is probably shocked and confused. He might not understand why the village would take such a harsh step just for hurting Sasuke. He may feel betrayed, especially if he thought he had friends and allies in the village.