One Piece: My Partner Is Known as Kamen Rider

In fact, I think there is no need to reduce the role of the protagonist even if you are writing a ship story. The author has been following Luffy since he was young, so he must be a deputy captain no matter what. I read that after the Wano chapter of Oda's manga ended, Buggy and Luffy became the Yonko. But there was a funny scene where Bucky's head was being held by Lao Sha, and Hawkeye held it against Bucky. Bucky almost said, "Please let me lick your (Krokdal) shoes." Galdino, who was called the Imperial Vice-President, served Crocodile with a flattering expression. Nami, the head of the Straw Hats, was so angry that she beat Luffy into a pig's head and locked him in a cage. You can position the protagonist as a counselor, and add in the childhood brotherhood. Shouldn't it be a common thing to discipline the captain? Moreover, Luffy's group is no less hierarchical than other pirate groups. You are just making headlines, and you can't find the protagonist in your story even if you look around.

I feel like the protagonist's role is a bit small

Come on. Five star encouragement

I don't understand what you're writing about. You talk about chivalry in the world of One Piece. It's funny. You spend most of your time in the water.