Perhaps he meets an ancient sage or a hermit who has the knowledge of regeneration. This character could guide Shino and provide him with the necessary herbs, incantations or mental exercises to regrow his arm. It could be a spiritual journey for Shino as he has to prove himself worthy to receive this knowledge.
In some fanfictions, Shino might regenerate his arm through special ninja techniques. For example, he could use a rare form of medical ninjutsu that he discovers or is taught. Maybe there's a hidden scroll in his clan's archives that reveals a way to regrow limbs.
One common theme is self - discovery. Shino often discovers new things about his arm, which leads to him understanding more about himself. For example, he might find a hidden power in his arm that makes him realize he's stronger than he thought.
There's also a fanfiction where Shino's arm gets injured and he has to learn to adapt. In this story, his friends in Naruto's world come together to help him. It's a great exploration of friendship and the challenges one can face. This fanfiction really makes you feel for Shino and his struggle with his arm situation.
A common plotline could be Naruto using his regeneration to survive near - death battles. For example, against a powerful new enemy that he would have otherwise lost to without this ability.
In fanfiction, Naruto and Shino's friendship can be really interesting. Naruto's exuberant personality contrasts with Shino's more reserved nature. For example, Naruto might be the one to drag Shino into all sorts of adventures, while Shino would use his intelligence and bug - related skills to get them out of trouble. Their friendship could also develop over training sessions, with Naruto learning about Shino's unique abilities and respecting him more for it.
They could start by sharing common goals. For example, they both want to protect Konoha. Working towards this goal side by side can bring them closer. They might have conversations during their guard duties about their dreams and fears.
Sasuke could be a candidate. Given their complex relationship, Sasuke might find a way to give Naruto a new arm as a way to atone for their past differences. He could have discovered some rare medical ninjutsu during his travels or come across a powerful artifact that he uses to create a new arm for Naruto.
One idea could be a story where Naruto and Shino go on a mission together. Shino's calm and calculating nature complements Naruto's impulsive and energetic style. They face a powerful enemy that requires both of their skills to defeat. For example, Naruto uses his shadow clones to distract the foe while Shino uses his bugs to find the enemy's weak points.
Another theme is his bug abilities. Fanfictions often expand on how his bugs can be used in different ways, like for espionage or in unique battle strategies. For instance, there are stories where Shino uses his bugs to solve mysteries within the village. Also, his relationship with other characters, especially his team members, is a common theme. Some fanfictions focus on how he interacts with them and how they influence his growth as a ninja.