Another aspect could be a fanfiction set in an alternate universe where Genkai and Younger Toguro are allies against a greater evil. They could use their combined skills and knowledge to fight off powerful demons. This would show a different side of their relationship, more of a partnership than what we might expect from their normal interactions in the original series.
In some fanfiction, they could be involved in a tournament together. Genkai as a mentor figure guiding Younger Toguro through the challenges of the tournament, teaching him strategies and how to control his emotions during the battles. This would show their relationship evolving in a high - stress environment.
Well, it could be something like a fire - based kekkei genkai that allows Naruto to control blue - flame fire which is hotter than normal fire. This would give him an edge in battles and also a new look to his fighting style.
Well, in some fanfictions, Naruto might obtain all kekkei genkai through some sort of ancient and powerful jutsu. Maybe he discovers a hidden scroll or meets a mysterious sage who imparts this power to him.
It could be a water - based kekkei genkai. Since the Wave arc has a lot to do with water, it would make sense for Naruto to awaken a kekkei genkai related to water. This could give him an edge in battles, especially in the Wave region where water is abundant.
One common combination is the Sharingan and the Rasengan. The Sharingan's ability to analyze and predict movements can be really useful when Naruto is forming and launching a Rasengan. Another could be the Byakugan and Sage Mode. With the Byakugan's enhanced vision, he can better sense the chakra flow around him in Sage Mode, making his attacks more precise. Also, sometimes you see him with the Ice Release along with his regular Wind Release. He could then create ice - infused wind attacks that are both cold and sharp.
Hashirama Senju had the Wood Release kekkei genkai. He was the founder of the Hidden Leaf Village. His Wood Release was so powerful that he could create huge forests in an instant. He used this power to end many battles. His story was intertwined with the history of the ninja world. He made peace treaties with other villages. He was also in a constant struggle against Madara Uchiha. His Wood Release was a symbol of his strength and his will to create a peaceful ninja world.
The Ice Release is a great elemental kekkei genkai. It combines Water and Wind elements. Those with this kekkei genkai can create large ice structures, freeze opponents, or even create ice mirrors for strategic combat. Another powerful one is the Magnet Release, which combines Earth and Lightning. Shinobi with this can manipulate magnetic fields, which is useful for controlling metal weapons and even attracting or repelling opponents.
One popular godlike kekkei genkai in fanfiction is the ability to manipulate time. This can range from simply slowing down or speeding up time in a small area to full - on time travel. It gives the character an incredible advantage in battles and can lead to really interesting plot twists.