I'm writing a book and I just know Mihawk would be so fucking interested. Crocodile, perhaps if there's a chance it'll be popular and gain attention especially, maybe, BUT MIHAWK
(Prepare for imminent nerding out over writing)
Okay but like I'M interested though. Not asking for details, I think I've only ever shared one of my original short stories here one time and sharing details on your original work in a public format can be incredibly risky. But I'm so so happy for you and I hope you enjoy the process from start to finish ❤️ ❤️ I have a few first drafts (two horror and one fantasy) that have been sitting in editing hell for years now that I hope I can get back to eventually, as well as a full D&D campaign set in an original world that I've only gotten to test out one time but...hard to say. Definitely won't be getting back to them any time in the immediate future.
(Nerding out concluded, we may now return to our previously scheduled simping)
Mihawk and Crocodile BOTH strike me as being well-read, and they would both be enthusiastic in their own ways.
I feel like Crocodile would be interested regardless of the potential for gain. The idea would of course be in the back of his mind, but if someone manages to get under his skin enough that he legitimately cares about them, he's going to care about their passions as well regardless. He'll likely use his own influence to ensure that you're successful, but that would be more for you than for him. He'd want to see you able to capitalize on your creative passions, not for his own personal gain but because he believes you deserve to have something to show for your work—and if he has the resources to ensure that happens, he'll utilize them without a second thought.
I can't say that Mihawk's interest would be more legitimate necessarily, but it would be far more honest. He's going offer constructive criticism, whether you want him to or not—not to be rude, but because he knows through his own passion for swordsmanship that there's always room for improvement, always something new to learn, and that stagnation in any art means a potential for regression. He'll be so meticulous in consuming your work that you'd have absolutely no need for an editor. Whatever draft you hand him would be returned with extensive notes that he would be more than open to discussing with you—not to insult your hard work, but to show that he cares enough about it to offer you the honesty and encouragement necessary to hone your talents, rather than simple placation and blind compliments.
Both of them would be fiercely supportive—again, in their own ways.