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.
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 entirely sure as I haven't read this novel specifically. But from the title, it might be about an isekai mage who is unable to use magic. Maybe it's about his/her struggles and adventures in the new world without relying on magic powers.
Similar novels to 'isekai majutsushi wa mahou wo tonaenai novel' could include 'Overlord'. In this novel, the main character has to deal with being in a new world with his own set of powers and limitations. Also, 'Log Horizon' might be relevant as it's about characters trapped in a game - like isekai world and they have to figure out how to function. These novels, like the one in question, often deal with characters in strange new worlds having to adapt and overcome various obstacles, whether it's related to power or not.
I'm not sure if it's popular. There are so many novels in the isekai genre that it's hard to say without more information. It could be a niche novel that has a dedicated following, or it might be relatively unknown.
I'm sorry, I don't know who the author of this novel is. There are so many isekai novels out there, and without more information, it's hard to determine the author.
I'm not entirely sure as I haven't read this novel specifically. But generally, in the isekai genre, it might be about a character being transported to another world and magic being involved in some way, perhaps the magic in this world is 'late' or different in some sense as the title 'okureteru' might imply.
The title 'isekai mahou wa okureteru light novel' gives some hints about its content. 'Isekai' is a popular genre where a character is sent to a parallel or different world. 'Mahou wa okureteru' can be translated as 'the magic is late' or 'the magic is behind'. So this light novel might be about a character who enters an isekai world but discovers that the magic system there is not as advanced as they thought it would be, or perhaps the magic is not easily accessible at the beginning of their adventure, which then sets up various challenges and plot developments for the story.