Well, for starters, Sanji would be very distrustful. He doesn't like people who are not straightforward. Usopp would probably be the most vocal about his concerns. He would constantly be warning the others about Kuro. However, as time passes, if Kuro shows some positive changes, the reactions might change. Luffy's open - mindedness could start to influence the others. And maybe, just maybe, they could all start to see Kuro as a part of their wacky crew, but it would be a long and bumpy road.
The Straw Hats' reactions would be mixed. Chopper would be a bit scared at first. He's not used to such a menacing - looking character. Robin, on the other hand, would be very observant. She would study Kuro's every move to see if he has any hidden agendas. Franky would be more straightforward and might challenge Kuro to prove his loyalty. Brook would probably make some jokes about Kuro's appearance and past, which could either ease the tension or make it worse.
Luffy might be excited to have a new member, as he always is about making new friends. But he's also not stupid, he would keep an eye on Kuro. Zoro would be very skeptical. He doesn't trust easily, especially someone with Kuro's reputation. Nami would probably try to figure out how she can benefit from Kuro's skills, while also being cautious not to be double - crossed.
Well, if Captain Kuro joins the Straw Hats in the fanfic, it could bring a lot of chaos at first. He has his own devious ways and skills. But maybe he could be reformed. The Straw Hats are known for their ability to change people. He might use his intelligence in a more positive way for the crew, like helping them plan strategies against other pirates or find hidden treasures.
Luffy would probably be excited. He loves having new and interesting people on his crew. Zoro might be a bit cautious at first but would come to respect Naruto's fighting skills. Nami would see Naruto as someone who could be useful for his abilities.
In such a fanfiction, the plot could involve Robin being a young prodigy. Maybe she initially has some secrets that she's hesitant to share with the Straw Hats. For example, she might be on the run from some powerful organization that wants to use her knowledge for evil. As she joins the Straw Hats, she slowly starts to trust them more and more. She could use her intelligence to help the crew out of tricky situations, like deciphering ancient maps or understanding the language of long - lost civilizations. And along the way, she forms deep bonds with each member, especially Luffy who accepts her without hesitation, which gives her a sense of belonging she's never had before.
At first, not very well. The Straw Hats have had bad experiences with Marines. They might see the Marine OC as a potential threat. However, if the OC shows that they are different from the typical corrupt Marines, like by helping the crew out of a tough situation right away, they might start to be more accepting.
She would likely become more open. At first, young Robin might be reserved due to her past experiences. But as she spends time with the Straw Hats, she'll start to share more about herself. For example, she could gradually open up about her family and her dreams for the future. Her confidence would also grow. The Straw Hats' acceptance and support would make her believe in herself more. She might become bolder in using her skills, like when exploring dangerous ruins or facing powerful enemies.
Naruto is known for his loyalty and determination. If he joins the Straw Hats in fanfiction, these traits would strengthen the crew's unity. His loyalty would mean he'd always have the backs of his new pirate friends, and his determination would inspire them to keep pushing forward, especially in the face of difficult challenges. For example, when they encounter a powerful enemy, Naruto's refusal to give up would encourage the Straw Hats to keep fighting no matter what.
It could be Chopper. Since Chopper is a doctor and Reiju has some medical knowledge, they might bond over sharing medical techniques and treating the crew's injuries. Also, Chopper's kind - hearted nature would make him a great friend for Reiju who might be used to a more cut - throat family environment.
He might become more relaxed. The Straw Hats are a very laid - back and fun - loving crew compared to Law's more serious group. So, being around them, Law could start to crack jokes more often and not be so uptight all the time. For example, he might start to participate in Usopp and Luffy's silly games on the ship.
Well, it could be really interesting. There would probably be a lot of initial distrust from the Straw Hats, since they are usually against the Marines. But if the OC has a good heart and a strong reason for leaving the Marines, like disagreeing with their corrupt ways, the Straw Hats might gradually accept them. The OC could bring in some unique skills and knowledge about the Marines' operations, which could be useful for the crew in various situations, like getting out of tight spots when facing other Marine forces.
Some Avengers might be excited. Captain America, for example, would probably welcome Nightwing for his sense of justice and fighting skills. Thor might be intrigued by this new addition from another world (in a sense, as Gotham is different from Asgard). However, Hulk might not care much as long as Nightwing doesn't get in his way during a fight. Overall, there would be a mix of curiosity and acceptance.