One interesting storyline could be Chopper discovers a new type of medicine on an island and Robin helps him research it. Their different skills, Chopper's medical knowledge and Robin's ability to read Poneglyphs, combine to unlock the secrets of this new medicine which could potentially save many lives in the One Piece world.
One way to develop their relationship further is through cultural exchange. Since Chopper is from Drum Island which has its own unique culture and Robin has traveled to many different places, they could exchange knowledge about different cultures. Robin could teach Chopper about the ancient cultures she has studied through Poneglyphs, and Chopper could share about the traditions on Drum Island. This would not only expand their knowledge but also bring them closer together as they learn more about each other's backgrounds.
Chopper is very much alive in the One Piece manga. The creators haven't written his death into the story. He's an integral part of the crew and their journey continues without that tragic event.
The fanfiction can also add a new dimension to the characters. Chopper's relationship with lemons can show different aspects of his personality. If he's really into studying the lemons, it can highlight his scientific curiosity. And it can create new dynamics within the Straw Hat crew as they interact with Chopper's lemon - related adventures.
One interesting fanfiction could be about Chopper's further adventures in a new, uncharted island where he discovers a unique type of medicinal plant that has strange effects on the Straw Hat crew. Another might be a story where Chopper has to take on the role of the ship's doctor in a really difficult situation when all the other crew members are incapacitated. There could also be a fanfic that focuses on Chopper's past, delving deeper into his time before he joined the Straw Hats and how he coped with being alone as a reindeer in a human - dominated world.
Well, one interesting storyline could be Chopper getting involved in a zany adventure on a new island where he discovers a unique type of lemon that has magical healing properties. He then has to protect this lemon from pirates who want to use it for evil purposes.
I don't really know the exact characteristics as it depends on the writer. But generally, it might combine the personalities of Robin and Chopper in unique ways within the story.
Robin is crucial in the One Piece novel. Her knowledge of the Poneglyphs makes her a key figure in the search for the One Piece. She can decipher the ancient texts that hold secrets about the Void Century and the true history of the world. This knowledge not only aids the Straw Hat crew in their adventure but also makes her a target for the World Government.
I like the storylines where Robin forms deep friendships in the fanfictions. In one, she befriends a group of scholars on an island. They exchange knowledge and she helps them protect their research from pirates. It's a great display of her character values. There are also storylines that explore her relationship with the other Straw Hats in new ways, like how she teaches Usopp about ancient plants.
Growth is a prevalent theme. Chopper, as a character, is constantly evolving, and Robin plays a role in that in these fanfics. They also often have themes of discovery. Whether it's exploring a new island or uncovering a mystery, they do it together. Their relationship is at the center of these stories, and the exploration of their different personalities is also a common aspect. For instance, Chopper's innocent and curious nature against Robin's more reserved and intellectual one makes for interesting interactions.