In an alternate world where Oden was evil and stronger than Gol D. Roger and Whitebeard, the course of history in the world of One Piece would have been vastly different. Oden, being the daimyo of Kuri and a member of Wano's ruling family, the Kozuki Clan, would be a strong threat to the stability of the entire world. Oden's immense strength and cruel intentions would lead him to completely overpower his adversaries during the Battle of Edd War, which took place between Roger Pirates and Whitebeard Pirates. Given his ruthless nature, Oden would not spare the lives of his weaker opponents as he would seek to assert his dominance over the seas. In the aftermath of the battle, the implications were far-reaching, influencing the world of pirates seeking the ultimate treasure, One Piece, and playing a significant role in shaping the aspirations of the incoming era of piracy. Meanwhile, Oden's reign of terror would extend to the Land of Wano. As a ruler, he would perpetuate fear and suffering among the people of Kuri, exploiting their labor and resources to further his ambition. Instead of working with his fellow retainers and the Minks of Zou with a noble intention to open Wano's borders, Oden would twist this goal into enslaving the people, turning Wano into a dark empire forged by his ambition and hunger for power. In the midst of Oden's atrocities, powerful pirates in the New World would have no choice but to confront this new enemy or reluctantly form alliances just to protect their territories and crews. The Yonko, the strongest and most influential pirate captains operating in the Grand Line, would be faced with a new rival - one they've never expected would emerge from the shadows. This turn of events would ultimately change the focus of Gol D. Roger and Whitebeard's goals, shifting from acquiring One Piece to fighting against the greater evil that resided within Oden. Roger, known for his deep love for freedom, would find Oden's oppressive rule abhorrent, igniting a sense of responsibility to put an end to Oden's tyranny. On the other hand, Whitebeard's ambition to create the perfect family would propel him to protect those who were oppressed and tormented by Oden's evil deeds. As Oden continued his conquest of the seas, the entire world would be direly threatened by his actions. This new and powerful villain would bring about a sense of unity among pirates, marines, and even rival nations. The need for cooperation to defeat such an overwhelming force would forge new alliances and bonds that transcend various boundaries, resulting in a more united world than ever before. Ultimately, Oden's threat would bring forth an epic war involving Pirates, Marines, and the Revolutionary Army, resulting in a new turning point for the world of One Piece. New heroes would rise from the ashes of this destructive force, while the legacies of Gol D. Roger and Whitebeard would be remembered for their sacrifice and their determination to protect the freedom and dignity of people across the seas.

1. "I'm going to become the King of the Pirates!" - Monkey D. Luffy, One Piece 2. "I am the hope of the universe. I am the answer to all living things that cry out for peace. I am protector of the innocent. I am the light in the darkness. I am truth... ally to good, nightmare to you!" - Goku, Dragon Ball Z (English dub) 3. "When people are protecting something truly special to them, they truly can become as strong as they can be." - Naruto Uzumaki, Naruto 4. "It's just pathetic to give up on something before you even give it a shot." - Reiko Mikami, Another 5. "The world isn't perfect, but it's there for us trying the best it can. That's what makes it so damn beautiful." - Roy Mustang, Fullmetal Alchemist These quotes are known for shaping their respective animes' themes and ethos, inspiring fans around the globe.

Had Kokushibo never turned into a demon in the Demon Slayer (Kimetsu no Yaiba) series, there would be significant changes to the story and its characters. Firstly, Kokushibo, born as Michikatsu Tsugikuni, would not have become the Upper Moon One, one of the strongest and most loyal demons serving Muzan Kibutsuji. As a result, Muzan's Twelve Kizuki, the elite demon group, would have been less powerful and less formidable, giving demon slayers a comparatively better fighting chance against them. Without Kokushibo's extraordinarily long lifespan, owing to his demon form, he would have had to face mortality and the natural consequences of aging, like other humans. Being a skilled samurai, he would have left a legacy in martial arts, possibly mentoring other samurai, including his descendants. He could have had a more meaningful connection with his half-brother, Yoriichi Tsugikuni, maybe even learning the Breath of the Sun techniques. The emotional impact of his brother Yoriichi's death would be more profound, as the two could have had a deeper bond should Kokushibo not have been consumed by jealousy and demon transformation. Consequently, the Tsugikuni family might have had a stronger influence on future generations, spreading Yoriichi's techniques and philosophies among other demon slayers. Not turning into a demon would also indirectly affect other characters in the series. The battle between Kokushibo, Upper Moon One, and various high-ranking demon slayers, including Gyomei Himejima, Mitsuri Kanroji, Obanai Iguro, Sanemi Shinazugawa, and Muichiro Tokito, would not have taken place. This might have altered the paths of these demon slayers, who could have faced different challenges and adversaries or focused more on other targets like Muzan Kibutsuji. Some of them may have even survived longer, potentially passing down their knowledge and martial arts to younger demon slayers. In summary, if Kokushibo never turned into a demon, the power dynamics and storyline of Demon Slayer would have changed substantially, with implications for many characters, their battles, and their journeys.

If the doctor had not saved Muzan Kibutsuji from death in Demon Slayer (Kimetsu no Yaiba), the entire course of the series would have been drastically different, as Muzan is the primary antagonist and a key driving force for the story. Without Muzan's survival, the creation and spread of demons would have halted, as he was the first and original demon who held the power to create more demons. It is important to note that nearly all the demons in Kimetsu no Yaiba can be traced back to Muzan. This would have led to a world with significantly fewer demons, considerably changing the purpose and actions of the Demon Slayer Corps. Due to the absence of demons or a substantially reduced number, the Demon Slayer Corps might not have been established, or they would have been a smaller organization dedicated to eradicating the remaining demons. The squad might not have gained as much prominence, and the need for Hashiras (Pillars) would have been less urgent. In a world without or with fewer demons, the tragic incident where Tanjiro Kamado's family was brutally murdered would not have occurred. Tanjiro and Nezuko, the protagonists, would have led ordinary lives, and Tanjiro would not have become a demon slayer. Moreover, the other central characters, like Zenitsu Agatsuma and Inosuke Hashibira, would have taken different paths in life, without the shared goal of defeating demons. In the absence of the threat posed by Muzan and his minions, the world of Demon Slayer would have experienced relative peace, with the focus on everyday struggles rather than the constant battle against demonic forces. While other threats and villains could still emerge, the overarching storyline would be entirely different, and the show would lack the defining conflict between demons and demon slayers.

If Tanjiro had not left his house to sell charcoal in Demon Slayer (Kimetsu no Yaiba), the series of events that follow would have unfolded differently, although the fate of his family might not have changed significantly. Upon returning from selling charcoal, Tanjiro discovered that his family had been brutally murdered by a demon, with Nezuko, his sister, being the sole survivor but turned into a demon herself. If Tanjiro had not gone that day, he would have been at home when the demon attacked his family. Even though Tanjiro was a capable fighter, he wasn't equipped or knowledgeable about combating demons at that time. The chances of him being able to single-handedly protect his family from the demon were rather slim. In this scenario, there are two likely outcomes. The first possibility is that Tanjiro would also have been killed alongside his family. Consequently, the story of Demon Slayer would lose its protagonist and his journey to avenge his family and seek a cure for Nezuko. The second possibility is that Tanjiro would have been seriously injured or incapacitated during the demon's attack. His instinct to protect Nezuko might have contributed to her transformation instead of her death. This could result in a similar storyline to the original, with Tanjiro seeking to avenge his family and cure his sister, but perhaps with added anger and despair at defending his family in person but failing to save them. Either way, the demon attack on Tanjiro's home would have still played a pivotal role in shaping the story of Demon Slayer, as it sets up the essential premise and transformative journey of the main characters.

Gol D. Roger, the Pirate King from the anime and manga series One Piece, has a "will" that is not explicitly stated. His will can be considered more of a guiding spirit and ambition that has driven many aspiring pirates to chase after the legendary treasure, known as One Piece, and consequently bring about a new age of piracy. Roger's journey to the Grand Line and the New World, ultimately leading him to the elusive final island Raftel (now known as Laugh Tale), inspired many others to set sail and embark on their own adventures. As he was about to be executed, Roger shouted that his treasure existed, challenging anyone who sought it to find One Piece. His will, though never directly articulated, encourages a sense of exploration, freedom, and a pursuit of one's dreams. It is believed that the person who finally finds One Piece will also reveal many of the hidden truths in the One Piece world, including the history of the Void Century and the mysterious ancient weapons. It is also said that this person will cause a significant upheaval that will shape the course of history in the One Piece world. In summary, Roger's will can be interpreted as a driving force that has inspired pirates, including the protagonist Monkey D. Luffy, to chase their dreams and seek out the legendary One Piece, which may ultimately lead to a significant turn of events in the world.

If Caesar Clown infiltrated the Thousand Sunny, which is the Straw Hat Pirates' ship, and began releasing poisonous gas, it would create a dangerous and chaotic situation. The Straw Hats would need to react quickly and utilize their strengths as a team to combat this immediate threat, keeping in mind that a few members possess abilities specifically suited to dealing with such a situation. Firstly, during the initial chaos, Nico Robin would try to locate Caesar and immediately use her Devil Fruit powers to incapacitate him. Her ability to generate limbs virtually anywhere she can see would help her detain Caesar or at least delay his escape. Simultaneously, Sanji and Zoro could assist Robin in physically confronting Caesar while the rest of the crew makes efforts to minimize the effects of the poisonous gas. Secondly, the crew would rely on Chopper, the ship's doctor, for a course of action concerning the poisonous gas. His medical expertise and knowledge of various toxins would give the crew guidance on handling the gas and potential safety measures or antidotes. Furthermore, Chopper might be able to develop an impromptu treatment to keep his friends from succumbing to the poisonous effects. Meanwhile, Jinbe, being a skilled helmsman, would sail the ship toward safer waters to minimize any external threats that might arise during this crisis. Nami, the navigator, would help Jinbe in ensuring that their ship sails in the correct direction in search of safety. Lastly, as the captain, Monkey D. Luffy would lead his crew in their efforts to save the ship and themselves. With his strong instincts and Devil Fruit abilities, he would play a crucial role in containing the situation. Despite the Straw Hats facing potent threats throughout their journey, they have continually showcased their ability to overcome challenges as a team. Thus, it could be reasonably assumed that they would come up with a strategy to mitigate the poisonous gas threat and ultimately defeat Caesar Clown. However, the entire encounter might leave the crew with a lingering sense of vigilance, leading them to take precautions against any future ambushes.