Yes, there is a Ninja Kamui manga. It has gained popularity for its action-packed scenes and interesting character developments. Many fans enjoy collecting and reading it.
One possible plotline could be that Tsukuyo becomes Gintoki's caretaker in a way. She helps him navigate the world around him, and in the process, their relationship deepens. Gintoki, who is used to being independent, has to rely on Tsukuyo, and this new dynamic changes their feelings for each other.
I'm not sure about specific fanfics where Gintoki is blind in relation to Tsukuyo. However, you can try searching on fanfic platforms like Archive of Our Own or Fanfiction.net. Use the relevant tags such as 'Gintoki', 'Tsukuyo', and 'blind' to narrow down your search.
Gintoki manga is very popular. It stands out for its engaging narrative, memorable characters, and the way it combines comedy and adventure. Fans appreciate its creativity and the depth it offers.
Naruto using Kamui could change the power dynamics in the Naruto universe in the fanfiction. His battles would become more unpredictable. For instance, against strong opponents like Madara or Kaguya, Kamui could be used in creative ways. He could use it to send parts of their attacks to another dimension, or quickly dodge attacks and counter - attack from unexpected angles. It also might make his allies view him differently, as this new power is something very different from his normal ninjutsu.
In many fanfictions, Naruto might initially discover Kamui through an encounter with Obito or Kakashi. Maybe during a battle where he witnesses the power of Kamui first - hand, and his inquisitive nature leads him to start exploring how to learn it.