It would be a wild combination. Vegeta's serious and prideful nature would contrast with Luffy's carefree attitude. But his combat skills would be a great asset. He could probably take on the toughest enemies easily. He might not get along well with Usopp at first because of Usopp's cowardly tendencies, but over time, he could teach Usopp to be braver. And his presence would make the Straw Hat crew even more feared among their enemies.
One great rival could be a character with a powerful Devil Fruit ability. For example, a character who has a Logia - type Devil Fruit that allows them to turn into a natural element like lightning. This would make them very difficult to defeat in combat as they could dodge attacks easily. They could also use their element - based powers to attack the Straw Hat Pirates in unexpected ways, such as sending bolts of lightning towards their ship.
The order in which the main characters of One Piece joined the Grass Hat Pirates was as follows:
1 Monkey D Luffy
2 Nico Robin
3 Franky
4 Choba (Chopper)
5 Brook
6 Sauron (Sengoku)
7 Nami
8 Usopp
9 Sanji
10 Nico Robin's father
The above are the original members of the Hat Pirates. As the plot developed, Luffy, Nami, Usopp, Sanji, Sauron, Choba, and Franky joined one after another. Nicole Robin also joined the Hat Pirates at some point later.
First, understand the Straw Hat Pirates' personalities well. For example, Luffy's carefree and determined nature. Then, create an OC (Original Character) that can interact meaningfully with them. Maybe the OC has a special skill or a unique backstory that ties into the pirates' adventures. Think about how the OC can join their crew or be an ally in their journey.
One popular trope is the 'lost relative' trope. For example, the OC could be a long - lost relative of one of the Straw Hat Pirates. Another is the 'powerful newcomer' trope, where the OC has some extraordinary power that helps the crew in a difficult situation. There's also the 'love interest' trope, although this can be a bit overdone. The OC might fall in love with one of the pirates or vice versa.
The crew would be really curious. They might see Luffy's father as a powerful ally. It could also boost their morale, knowing that Luffy has such a strong family connection.
A rival could be motivated by envy. The Straw Hat Pirates are known for their fame and the bonds they share. Another pirate or character might envy their camaraderie and the way they are able to overcome difficulties together. So, they want to break the Straw Hat Pirates apart and prove that their own way is better.
The Straw Hat crew would have a mix of reactions. Franky might start building a special nursery on the ship, using all his engineering skills to make it safe and comfortable. Robin would be a source of calm and knowledge, sharing stories about pregnancies in different cultures she's read about. Brook would be playing gentle music to soothe Nami. And Luffy, as the father, would be constantly by Nami's side, sharing his positive energy and telling the baby stories about their adventures, even though the baby can't hear them yet. Overall, the crew would come together to support Nami and the new life coming into their world.
In the story of One Piece, the people who had the best chance of joining the straw hat group after the war with the country included:
[1. Vivi: As the princess of the Hezhi Kingdom, her strength and status are very high and she is a very valuable ally to the straw hat group.]
2 Sauron: As a swordsman of the Grass Hat Pirates, he is very powerful and has always dreamed of becoming a great swordsman.
3. Yamaji: As the chef of the straw hat pirates, his cooking skills are superb and he is good at using various potions and magic.
4. Nami: As a navigator of the Grass Hat Pirates, she has excellent navigation and observation skills and has a deep understanding of marine ecology.
5 Choba: As a doctor in the Grass Hat Pirates, he is good at healing all kinds of animals and plants and can use all kinds of drugs.
6 Brook: As a musician in the Hat Pirates, he has outstanding musical talent and can play all kinds of music with instruments.
These are the people I think have the best chance of joining the Hat Pirates. Of course, there are many other people who have the chance to become members of the Hat Pirates.
😋I recommend the following doujin novels to you:
1. [One Piece: The Strange Pirate Kidd]: It tells the story of Yunfei who transmigrated into the world of pirates and possessed the ability of the Devil's Fruit that could change the world. He also pushed the strong from all walks of life and became stronger. Doujinshi novels were slow and gradual, and the later the story, the more exciting it would be. The world structure and power system did not deviate from the original!
2. "One Piece Begins with Breathing Technique": Hood Hill accidentally transmigrated to the world of One Piece and obtained the witness system. He could become stronger by witnessing the plot and become a dancer of the Grass Hat Pirates, carrying out the world's greatest adventure. She followed Luffy and had a man's romance.
3. [The Mumu Fruit of One Piece: A young man who accidentally transmigrated to the world of pirates and ate the Mumu Fruit-Walter.] Walter had developed his own fruit ability through the Wood Evasion Ninjutsu of the Naruto Ninja. He joined the straw hat gang and followed Luffy and the others to complete the greatest adventure in the world. He became the pirate who terrified countless pirates and gave countless navies headaches-Wood Escape Ninja Walter.
I hope you like this fairy's recommendation. Muah ~😗