One idea could be that during a dangerous adventure, Zoro and Robin get separated from the crew in a mysterious island. There, they have to rely on each other for survival. As they face various challenges together, their bond deepens and a romantic relationship starts to form, filled with their unique personalities interacting. For example, Zoro's tough and straightforward nature combined with Robin's calm and intelligent demeanor.
A plot could be set in a parallel universe where Zoro and Robin are not pirates but rather scholars in a hidden ancient library. They meet while researching a very rare and powerful piece of knowledge. Their intellectual pursuits bring them closer as they decipher the mysteries together. Along the way, they develop feelings for each other, and their relationship blossoms in this unique environment away from the usual pirate life.
Perhaps in a scenario where the crew is attacked by a powerful enemy. Zoro gets injured protecting Robin. While he is recovering, Robin stays by his side to take care of him. They start to have long conversations about their pasts, dreams, and fears. This shared intimacy leads to a more affectionate relationship, and they start to see each other in a new light, different from just crewmates.
In the fanfiction, the baby could have some unique abilities inherited from both Zoro and Robin. For example, it could have Zoro's sense of direction in combat and Robin's ability to read ancient texts. This could lead to many interesting adventures as the crew tries to understand and help the baby develop these powers.
One idea could be that during a dangerous adventure, Zoro and Robin get separated from the crew. They have to rely on each other's skills. Zoro's combat abilities and Robin's knowledge of ancient texts help them navigate through an ancient, forgotten island filled with mysteries and traps.
One idea could be a time - travel plot. Zoro and Robin could be sent back in time to an era that Robin has only read about in history books. Zoro would have to rely on Robin's knowledge to survive, and Robin would depend on Zoro's combat skills. They could also encounter younger versions of their crewmates and have to figure out how not to disrupt the timeline while also trying to find a way back to their own time. This would be a great opportunity to explore their relationship in a new and exciting setting.
Maybe they find a strange fruit that has the power to temporarily swap their abilities. This leads to some comical and also interesting situations. Luffy tries to use Robin's powers to reach for things in a more elegant way, and Robin attempts to use Luffy's stretching ability to explore hard - to - reach places. It also makes them understand each other's perspectives better.
One idea could be that Robin and Artemis are on a solo mission together and get trapped in a strange, magical place. As they try to find a way out, their feelings for each other intensify. Another could be a post - battle scenario where they're both injured and have to rely on each other for care, leading to some romantic moments. Or perhaps a time - travel plot where they see alternate versions of themselves in different relationships and it makes them realize their feelings for one another.
One idea could be that Zoro ends up in a world full of magic. He has to learn to adapt his sword skills to combat magical creatures. Maybe he teams up with a local wizard who helps him understand the new world's rules while he teaches the wizard about honor in battle.
One idea could be Zoro seeking extra training from Mihawk in a secluded place. During this time, they start to understand each other's pasts and the reasons behind their swordsmanship. Another could be a scenario where they have to team up against a common enemy that threatens the world of swordsmen. This would force them to combine their skills and learn to trust one another on a deeper level.
Well, they could be in a situation where a powerful enemy targets female Luffy specifically because of her unique abilities as a female version of Luffy. Zoro vows to protect her at all costs. This could lead to some intense battles where Zoro has to fight opponents far stronger than him while trying to keep female Luffy safe. Meanwhile, female Luffy could be using her smarts and powers to find a way to defeat the enemy from the sidelines, perhaps by finding its weakness and relaying it to Zoro during the fight.
A plot for this fanfiction could be that Robin and Zoro keep the pregnancy a secret from the crew at first. But as time goes on, it becomes harder to hide. Meanwhile, they are also facing a new island with strange customs and threats that are related to Robin's pregnancy in some way. For example, the island has a law that pregnant women must perform a certain ritual, and if they don't, something bad will happen to the baby.
Perhaps Robin's red color is a sign of his being chosen by a secret order. He then embarks on a journey to learn the ways of this order, facing various challenges and making new allies along the way. In the fanfiction, his red attire could hold special significance within the order's lore.