One popular garp fanfiction story could be about Garp's early days in the Marines, his training and the friendships he formed. Another might focus on his relationship with his family members in a different light, like how he interacted with his grandson Luffy during Luffy's childhood. There are also stories that might explore Garp's role in some of the major events in the One Piece world from a different perspective.
One of the main themes is the search for identity. Garp is constantly trying to figure out who he is in the complex world around him. Another theme is the role of family. His family relationships, including his relationship with his mother, wife, and children, are full of love, conflict, and growth. Also, the idea of gender roles is explored, as Garp interacts with strong female characters and navigates through a society with certain expectations of men and women.
Well, AO3 is a great place to find high - quality garp fanfiction. It has a well - organized tagging system, so you can easily search for Garp - related stories. Additionally, some Reddit communities dedicated to One Piece might also have links or discussions about good garp fanfiction. You can also try following some One Piece fanfiction blogs on Tumblr. They often reblog interesting and well - written garp fanfiction.