Sora is likely a character created within the fanfic world. He could be a powerful shinobi with unique abilities that Naruto can learn from. Maybe he has a special chakra nature or some extraordinary combat skills.
Well, it depends on your perspective. Some might find it sad because of the difficult situations Sora has to go through, but others might see it as a journey of growth and resilience.
Yes, 'Ahiru no Sora' manga has come to an end. The final chapters tied up loose ends and provided a conclusive ending for the characters and their adventures.
One common theme is the clash of different worlds. For example, when Sora enters a new universe like the DC Comics world, his own world's rules and magic collide with the superpowers and technology there. Another theme is friendship. Sora often makes new friends in the crossover universes, like befriending Batman or Superman in a DC crossover.
It's hard to say for sure. Kingdom Hearts 3 could be the end of Sora's story in this particular arc, but the series is known for its complex and evolving narrative, so there might be more to come in the future.
Installing Yosuga no Sora visual novel isn't too complicated. You have to obtain the correct version of the installer. Once you have it, run it and just do as it prompts. Pay attention to any license agreements or additional settings it might ask for.
De-aged Sora fanfic often focuses on showing a younger version of the character with innocent and curious traits. It might explore how they handle new situations with their childlike perspective.