I'm not sure specifically as it's not a widely known novel to me. It could potentially be about using magic to control or open up an isekai (another world). Maybe it follows a protagonist who discovers this magic - related to isekai control and embarks on an adventure in a new world.
Since the details of this novel are not known to me, it's difficult to determine the main characters. However, in a typical isekai story with magic involved, there could be a young hero or heroine who discovers their power to control the isekai. There may also be an antagonist, perhaps someone who wants to misuse the power of the isekai or stop the protagonist from using their magic - based control. And of course, there could be various side characters like fellow adventurers, magical creatures, or wise old sages.
One characteristic is the isekai setting. The protagonist is transported from their normal world to a different, often magical world. Another is the use of magic. The characters usually have to learn to control and use magic in various ways to progress in the story.
I'm sorry, I haven't read this light novel specifically. But generally, 'isekai' often involves a character being transported to another world. If it's controlled by magic ('seigyo mahou de'), it might have a unique magic system and adventure plot in the other world.
The themes could include adventure and exploration. The idea of using magic to open up or control an isekai world implies that there will be a lot of unknowns to discover. There might also be a theme of friendship or camaraderie. In this new world, the protagonist may meet various characters and form bonds with them. Also, the struggle between good and evil could be a theme, as in many isekai stories, there are often forces that oppose the protagonist's actions in the new world.
I'm not sure specifically as there could be many novels with this title or related to this phrase. It might be about a story where the protagonist is transported to another world ('isekai' means another world in Japanese), perhaps with adventures, magic, and new characters.
Sure. One popular 'boku wa isekai de fuyo mahou' light novel could be 'That Time I Got Reincarnated as a Slime'. It has an interesting story where the protagonist is reincarnated in another world and gains unique magical abilities.
The 'isekai kara kita yuusha novel' likely tells a story full of fantasy elements. The hero coming from another world is a common trope in isekai stories. He could be summoned there by some magic or accident. Once in this new world, he may have to adapt to different cultures, magic systems, and races. His experiences would form the core of the story, which might include battles against powerful foes, exploring unknown lands, and uncovering the secrets of this new world.
I'm not aware of a specific work titled exactly 'isekai ni kita novel' being extremely popular. But there are many popular isekai novels in general, like 'Sword Art Online' which has some elements of being transported to a different world.
Since I don't know the exact novel, I can't say for sure. But usually, there would be the hero who comes from another world. There might also be characters who help or oppose the hero in the new world.