If Luffy knew Haki early, it would likely give him a significant advantage. He could take on stronger opponents sooner and perhaps even prevent some of the setbacks he faced originally. This could lead to a quicker rise to power and a different dynamic with his crew.
In this fanfiction, Naruto's development with Haki could be quite interesting. Firstly, Haki could enhance his sensory abilities even more than his regular chakra - based perception. This would allow him to detect threats from afar and better protect his village. His physical attacks could also become more powerful. He might start to train with different characters who are more familiar with Haki, like if there are any characters from other universes introduced. This could lead to him learning new values and cultures, expanding his world view, which in turn would shape his character in a more complex and mature way.
Yes, in many Naruto fanfictions, authors often give Naruto the power of Haki. It's a creative way to blend the concepts from One Piece (where Haki exists) with the Naruto universe. This can lead to really interesting storylines, like Naruto using Haki to sense enemies' intentions better during battles or using it to enhance his existing jutsu.
One idea could be a story where a new character, the OC, is a young chef who idolizes Katakuri. They enter a cooking competition in the Big Mom Pirates' territory and Katakuri takes notice. The OC tries to prove themselves worthy of his respect through their cooking skills.
One popular type of OC is a female pirate who is as strong - willed as Katakuri. She challenges him in a battle of wits and strength, and their interactions create a lot of tension and intrigue in the fanfiction. For example, she might try to steal a precious treasure that Katakuri is guarding.
One great Katakuri x OC fanfiction is 'A Sweet Encounter'. In this story, the OC is a baker who stumbles into Katakuri's world. The author does an amazing job of building their relationship gradually. It shows how the OC's kind nature starts to break through Katakuri's tough exterior. Another interesting one is 'The Unlikely Bond'. Here, the OC has a special power that intrigues Katakuri, and they form a bond while facing common enemies.
Naruto's use of haki would be a game - changer for his combat skills. Haki has different forms. For example, the Observation Haki could allow Naruto to see the future movements of his opponents to some extent. This would combine really well with his already amazing combat skills like his Rasengan and Shadow Clone jutsu. He could use his clones more effectively to surround and attack his enemies while using haki to predict their counter - attacks.
The popularity of Katakuri x OC fanfiction lies in the fact that Katakuri is a complex and interesting character. His stoic nature and his powers make him an appealing figure. When paired with an original character, it allows for a lot of creative freedom. Writers can create unique backstories for the OC that interact in interesting ways with Katakuri's own story.
In fanfiction, Naruto could potentially have all three types of Haki. Observation Haki would help him sense the presence and intentions of his enemies. Armament Haki could strengthen his attacks and defenses. And Conqueror's Haki might give him an aura of dominance over others, which could be really useful in battles or when dealing with political situations in the Naruto universe.
One interesting plot in Naruto Armament Haki fanfiction is that the Akatsuki organization somehow gets hold of the knowledge of Armament Haki and starts to train their members in it. This completely changes their power levels and their goals. For example, Pain could use Armament Haki to make his attacks even more devastating. Meanwhile, the Leaf Village has to scramble to understand this new ability and find a way to defend against it. There could also be a plot where a young, unknown ninja has a natural affinity for Armament Haki and is hunted by various factions who want to use his power for their own ends.