Often, Sakura becomes strong through intense training. She might train under a powerful master or by herself, pushing her limits. For example, she could be practicing her chakra control day and night to be able to use stronger jutsus.
In fanfiction, Sakura's intelligence is sometimes magnified. She becomes a master strategist, able to anticipate her enemies' moves. This, combined with her medical skills, makes her a force to be reckoned with. She can use her knowledge of the human body to find weak points in her opponents during combat, not just for healing.
If Sakura was strong in fanfiction, it could completely change the dynamics of the story. She might become a key player in battles and have a more significant impact on the plot.
Another way is to join fan communities related to the source material that Sakura is from. For example, if she's from a particular anime or manga, join the relevant forums or groups on social media. Members often share and recommend good fanfiction, including those with a strong Sakura.
Sakura as a strong Genin in fanfiction often has her character developed further. She could be shown to have a better understanding of chakra control, which allows her to perform more complex jutsu. Some fanfictions might also give her a unique kekkei genkai that makes her stand out. This could be something related to her already existing skills, like a form of enhanced sensory perception for medical ninjutsu, enabling her to detect internal injuries more accurately.
I'm not sure if there is such a specific fanfiction. Fanfiction can cover a wide range of themes and interpretations, but a 'perverted' aspect might not be in line with the general positive and creative nature of most fan works. It's possible that there could be some out - there that distort the characters in this way, but it's not a common or recommended type.
You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just use the search term 'strong Sakura Haruno' and browse through the results. You'll likely find a lot of great stories.
In strong fanfiction, Sakura is often depicted as having great medical skills along with enhanced combat abilities. For example, she can use her medical knowledge to heal herself during battles and fight more effectively. Hinata, on the other hand, is shown as having a strong will. Her Byakugan abilities are enhanced, and she becomes more confident in using them to detect enemies and plan strategies.
In some 'sakura is strong fanfiction', Kakashi could be an important character. He might be the one guiding Sakura in her journey to become stronger. And then there are also characters like Ino who could be her friend but also someone she competes with in terms of strength.
A fanfiction could focus on a mission where they are the main characters. Sakura uses her medical ninjutsu and brute strength, Ino her mind - related jutsu, Tenten with her weaponry skills, and Hinata with her Gentle Fist technique. They encounter a powerful enemy, but through their cooperation and the fact that they are all strong in their own ways, they manage to overcome it.