Another possibility is a rival pirate hunter. Someone who is jealous of Sakura's skills or success and tries to get in her way, perhaps by spreading false rumors about her or even directly interfering with her missions.
Sakura is often a main character. She could be a brave and intelligent girl with a mysterious past related to the sakura. The pirate captain is also likely to be a main character, perhaps a gruff but kind - hearted man who takes Sakura under his wing.
There could be a mysterious organization that has been hidden for a long time. They emerge when Sasuke and Sakura start their journey. This organization wants to use Sasuke's power and Sakura's medical knowledge for their own evil purposes. They set up traps and send assassins to target the duo throughout their journey.
The main antagonists could be other pirate crews. There might be a particularly ruthless pirate captain who wants to take over Percy and Annabeth's ship and all the treasures they might be after. This captain could be jealous of Percy's powers and see him as a threat.
Well, it could be the unique character of Sakura in the context of a pirate hunter world. Maybe she has special skills or a backstory that makes her stand out. For example, she might have some sort of martial arts training that helps her in hunting pirates.
It could be the navy. They see pirates as outlaws and would be determined to capture Percy and his crew. They might have better - equipped ships and more trained soldiers, making them a formidable foe for Percy and his fellow pirates.
Another possibility is a rival clan. They might target Sakura specifically because she is seen as a rising star within her clan and they want to undermine her clan's strength. For instance, they could try to kidnap her or spread false rumors about her to create discord within her clan.
One possible main antagonist could be a shinobi from another village who fears Sakura's potential as Hokage. This shinobi might try to undermine her by causing chaos in her village or spreading false rumors about her abilities. Another could be someone within her own village who has a long - standing grudge against her or her family and doesn't want to see her in a position of power.
The villagers themselves could be the main antagonists. Since Naruto has given in to hate, he may see the villagers' past mistreatment of him as unforgivable. Their judgmental and often cruel behavior towards him in his childhood could now be the reason he turns against them, making them the antagonists in this new narrative.
There could also be some within the wizarding community who oppose Harry learning the Unforgivables. They might see it as a sign that he is turning to the dark side and try to stop him, so they could act as antagonists in the story.
Obviously, Sakura would be one of the main characters. There could also be her best friend, who tries to comfort her while she is crying. Maybe a mysterious stranger who witnesses her crying under the sakura trees and is intrigued by her sadness.