Yes, there are likely some out there. Fanfiction websites like FanFiction.net and Archive of Our Own might have such stories. You can search using the relevant tags 'Naruto', 'Bleach', 'godlike', and 'harem' to find them.
One possible plotline could be a dimensional rift that brings the characters of Naruto and Bleach together. Naruto characters end up in the Bleach universe or vice versa. The main character, say a Naruto character in the Bleach world, gradually forms relationships with multiple female characters from both universes, creating a harem. They could go on quests to close the rift while dealing with the different power systems and politics of the two worlds.
One common theme is power combination. Writers often explore how Naruto's and Hinata's abilities from the Naruto universe can be combined or contrasted with the powers in the Bleach universe. For example, Naruto's chakra and Hinata's Byakugan might interact with reiatsu and zanpakuto in unique ways.
Power - up is a common theme. As characters from Naruto and Bleach come together in the harem, they often gain new powers or enhance their existing ones through their interactions. For example, Naruto might learn some spiritual techniques from the Bleach characters.
In 'naruto x bleach x fairy tail fanfiction', a great crossover idea is the sharing of knowledge among the characters. The scientific knowledge in Naruto, like the study of chakra, could be combined with the spiritual knowledge in Bleach and the magic knowledge in Fairy Tail. Maybe a character from Naruto could learn about the different types of magic in Fairy Tail and use it to enhance their own jutsu. And the Soul Reapers could use some ninja stealth techniques to better perform their duties.
One idea could be that Naruto, with his godlike powers, enters the Bleach universe and teams up with Ichigo. He could use his shadow clones to help in battles against Hollows, and his Rasengan could be modified to have an effect on spiritual beings. Maybe his Sage Mode gives him an edge in sensing spiritual energy in the Bleach world.
The idea of the two different worlds colliding is also fascinating. In a 'bleach x naruto crossover fanfiction', we might see the Hidden Villages from Naruto co - existing with the Soul Society in Bleach. How would they interact? Would there be trade, alliances or conflicts? This could lead to really engaging storylines.
It's hard to say for sure. Naruto in his Sage of Six Paths mode is extremely powerful, with access to a vast amount of chakra and the ability to create and manipulate Truth - Seeking Balls. But Ichigo, when he reaches his final form, can also be a force to be reckoned with, having the combined powers of his Hollow, Quincy, Soul Reaper, and Fullbringer heritage.
A Naruto x Rukia kiss in such a fanfiction would likely be a very emotional moment. Since they are from different universes, it would represent a connection that defies the norms of their respective worlds. It could be that Naruto is drawn to Rukia's calm and strong - willed nature, while Rukia is intrigued by Naruto's never - give - up attitude. The kiss might be a culmination of a long - building, unspoken attraction that finally surfaces in a moment of vulnerability.
It's really hard to say who would be the strongest. Naruto has the power of the Nine - Tails and all his ninja skills. Ichigo from Bleach has his Hollow and Soul Reaper powers. And characters in Fairy Tail like Acnologia are extremely powerful. But if I had to pick, I might say Ichigo. His ability to constantly evolve and his powerful sword strikes combined with his Hollow form could give him an edge over the others in a chaotic crossover battle.