You could start by researching historical accounts or legends about samurai that often have elements of love. Maybe look for books or online resources dedicated to such topics.
To begin with best samurai fiction, first consider your interests. If you like historical accuracy, 'Shogun' would be a good start. It gives a vivid picture of the samurai era. Another option is to start with collections of samurai short stories. For example, 'Tales of the Heike' which can give you a taste of different samurai tales in one book. You can also look for modern adaptations of samurai stories as they might be easier to understand at first.
Luffy and Zoro's bond would still be strong. Maybe in a reincarnated life, they meet as rivals at first in a martial arts tournament but soon realize they share the same goals and become partners again. Nami and Usopp could be siblings in their new lives, with Nami being the protective older sister and Usopp using his creativity in a new family dynamic.
In two novels, the protagonists possessed the Judge Brush when they reincarnated in the underworld. The first book was Divine Judge, a Xianxia-Mythological Cultivation novel written by the Supreme Thunder Emperor. The second book was " I Have a Judge's Pen ", a Xianxia modern cultivation novel written by Cui Geng.
The Japanese samurai mask had many uses. First of all, the mask could cover the face of the warrior and protect his privacy. Secondly, the mask could be used to intimidate the opponent. The ferocious appearance of the mask could intimidate the enemy. In addition, the mask could also increase the aura of the warrior, thus suppressing the enemy on the battlefield. Masks were divided into three categories, including half a head, cheeks, and full face. Half of the head covered a part of the face, the cheeks covered the face below the eyes, and the total face covered the entire face. Masks were usually made of iron, and there might be beards and other animal hair decorations on them. The method of making the mask included beating the iron plate into shape, then finishing it, and finally tying it to the face with a rope. In general, the mask of the Japanese samurai played a role in defense, deterrence, and increasing momentum in the war.