Character development is key. Fanfictions explore how Ace and Luffy grow under Garp's influence. Maybe Luffy becomes more disciplined in some stories, or Ace learns to be more open - hearted, all thanks to their interactions with Garp and each other.
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.
Well, in the world of Star Wars fanfiction, 'Roger Roger III' could be a really unique creation. Maybe it's a new type of protocol droid that has some special abilities or a backstory that ties into the existing Star Wars lore in an interesting way. It could be that the author wanted to create a character that adds a new element to the Star Wars universe, perhaps a droid with a sense of humor or a different kind of loyalty compared to the well - known droids like C - 3PO or R2 - D2. But again, we really need to look at the specific fanfiction to know for sure.