Maybe he starts to train with one - armed techniques. He could learn from other one - armed ninjas if there are any in the fanfiction world. His friends would also play a big role. They might encourage him to keep going or help him in his training.
It could be a gesture of affection or a way to start a conversation. Sometimes in fanfictions, small actions like this have deeper meanings related to the plot or character development.
Japanese horror stories often have unique and terrifying elements. When it comes to stories specifically related to the left arm, they might involve themes like cursed body parts. For example, there could be a story where a character's left arm starts to act on its own, perhaps with a strange mark on it that is the sign of an ancient curse. This could lead to all sorts of spooky happenings, like the arm reaching out for things in the dead of night without the person's control.
There's a visual novel called 'Fate's Twist' where a guy loses his arm due to a magical curse. The curse was cast by an evil sorcerer and has a significant impact on the character's journey and development throughout the story.
The way Oliver Queen loses his arm in comics isn't always the same. Sometimes it's a result of a risky mission gone wrong, or it could be from a confrontation with a villain with unique abilities. It all depends on the particular comic storyline.