Well, Naruto's chakra could be translated into a form of spiritual energy in the Bleach universe. His ability to create shadow clones might be similar to some low - level Hollow cloning abilities. As for Sasuke, his Sharingan could be a unique type of spiritual vision. Maybe it could detect hidden spiritual pressures or weaknesses in enemies. They would have to adapt to the different power systems in Bleach, like learning about Zanpakuto and the various forms of Hollowfication and Soul Reaper powers.
His chakra could be equated to reiatsu. So his powerful chakra attacks like the Rasenshuriken could be translated into a reiatsu - based attack in the Bleach world. For example, it could disrupt the spiritual balance of Hollows or Quincy.
Naruto's ability to use the Nine - Tails' chakra could turn into something like having a powerful spiritual beast companion in the Bleach world. Hinata's Byakugan could be enhanced to see spiritual auras more clearly and detect hidden spiritual threats. Their powers would also be influenced by the fact that they are now in a world with Shinigami, Hollows, and Quincy. They might learn new techniques from the Bleach characters and combine them with their own unique abilities.
One possible fanfic could be where Ichigo discovers new and enhanced Quincy powers that he didn't know he had. He might struggle to control them at first, causing some chaos in the Soul Society. But as he trains and learns more about his Quincy heritage, he becomes a more formidable force against the Hollows and other threats.
Their powers could be combined in a way where Ichigo's Zanpakuto spirit, Zangetsu, and Halibel's water - based powers merge. For example, Ichigo could gain the ability to use water - enhanced slashes that have the cutting power of his normal attacks along with the fluidity of Halibel's water attacks.
Sasuke's Sharingan could potentially be used to analyze the reiatsu patterns in the Bleach universe. This would allow him to predict the movements of his opponents, much like he does in the Naruto world. For example, if he was facing a Soul Reaper or a Hollow, he could see the flow of their reiatsu and anticipate their attacks.
It would be amazing. The characters in Fairy Tail could use Bleach powers like zanpakuto abilities. For example, Natsu could have a zanpakuto that enhances his fire powers even more. He might be able to use some of the unique techniques from Bleach, like flash step, which would make his combat style even more dynamic.
Another way Ichigo could get his powers back in fanfiction is through a magical or spiritual artifact. Maybe he discovers an ancient sword or a talisman that has the ability to restore his lost powers. This could be part of a grander plot where he has to go on a quest to find this item, facing various challenges and enemies along the way. During this journey, he might also learn more about the true nature of his powers and how they are connected to the overall 'Bleach' universe.
His Quincy powers could develop as a result of a new threat in the Bleach world. For example, if a powerful Quincy villain emerges who has a connection to Ichigo's past, he would be forced to dig deeper into his own Quincy abilities. He could learn new techniques like advanced Quincy arrow formations or the ability to manipulate spiritual energy in ways unique to the Quincy. This development could also lead to some interesting interactions with his Shinigami powers, creating a new and powerful hybrid fighting style.
One common plotline is Ichigo trying to get his powers back. He might embark on a quest, perhaps traveling to some hidden or dangerous places. Another is that he discovers new latent abilities within himself that he didn't know about before his power loss.