The plot of another dimension is recommended.

I'm not entirely sure about the specific plot of this light novel as it might be relatively niche. However, generally, it could potentially involve some sort of adventure or story set in another dimension where the concept of mixed bathing plays a role, perhaps in a cultural or social context within that dimension.

Well, perhaps Natsu could find himself in a dimension where magic works completely differently. He might have to learn new ways to use his fire magic or even discover new types of magic altogether. Maybe he meets alternate versions of his friends who have different personalities due to the different environment of that dimension.

Well, perhaps Percy could find himself in a dimension where the laws of physics are completely different. He might have to learn new ways to use his powers. For example, if water behaves strangely there, like it's solid in some areas and gas in others, he'd have to adapt quickly.

Maybe Amy discovers a magical portal in her attic that leads to another dimension. In that dimension, the laws of physics are different, and she has to adapt quickly to survive. There could be strange creatures she befriends or battles against.

One idea could be that Peter discovers he has special powers in this other dimension that he doesn't have in his own world. For example, he can control elements like fire or water. Another could be that he meets alternate versions of his friends and family, and has to deal with the differences in their personalities. Maybe in this dimension, his best friend is his enemy.

One idea could be Naruto being transported to a dimension where chakra doesn't exist, but he discovers a new form of energy and has to learn to use it from scratch. This would force him to adapt his fighting style completely.

In an 'Avengers Another Dimension Fanfiction', a cool plot might involve a dimension where technology and magic are one and the same. So Iron Man's suit could be powered by both arc reactor energy and some sort of magic spell. Or a dimension where the Avengers are part of a gladiator - like arena, and they have to fight not only their usual foes but also other heroes from different universes just to survive and find a way back home.

One possible plot twist could be that in the other dimension, Naruto finds out that all his friends have different personalities. For example, Sasuke could be a peaceful scholar instead of a brooding avenger. Another twist might be that the chakra system works completely differently in this new dimension. Maybe instead of using hand signs, they use some kind of mental power to perform jutsus. Also, Naruto could discover that the Akatsuki in this dimension are actually the good guys, fighting against an evil ninja clan that wants to take over the world.

Not sure. I haven't come across such a comic with bones from another dimension.

In reality, fictional characters aren't real in another dimension. They are just figments of our creativity, existing only in the stories we tell and the minds that conceive them. There's no scientific evidence to suggest they have a real existence elsewhere.