I'm not entirely sure as I haven't fully read it, but usually in such novels there is a protagonist who is at the center of the story. Maybe there's also a mentor - like figure who guides the protagonist on his journey.
In the 'Gate of God light novel', the main character is likely to be someone with unique abilities or a special destiny related to the gate. There may be other supporting characters such as a wise old man who has knowledge about the gate's history, a female character who is strong - willed and a valuable ally in battles, and a mischievous sidekick who provides some comic relief while also being useful in certain situations.
Typically in a 'Gate of God' - themed light novel, there would be a brave and curious main character who is drawn to the mystery of the Gate of God. There might also be a group of friends or comrades who accompany him. There could be an antagonist as well, perhaps someone who wants to use the power of the gate for evil or self - gain, and who constantly tries to thwart the protagonist's plans.
Since I don't know the specific 'light gate novel', I can't tell who the main characters are.
Yoji Itami is a main character. He is a soldier who gets involved in the events related to the gate. His character is interesting as he has to adapt to the new and strange situations in the fantasy world.
Without having read it, it's hard to say for sure. However, it's possible that the main characters could include a soldier who is stationed near the gate and gets caught up in the events of the gaiden. There might be a local from the world on the other side of the gate who becomes a guide for the characters from our world. And perhaps there's a researcher type of character who is studying the gate and its properties in this side - story light novel.
I don't have enough information to determine the main characters. They could be a young adventurer, a powerful wizard, or a brave knight.
I'm not entirely sure as there could be a variety of main characters. But often in such stories, there would be soldiers from the SDF. Maybe a young and brave officer who takes the lead in exploring the world beyond the gate.
The protagonist is Shin. He's a strong character who has to deal with the challenges of the new world.
Not having read the 'Gate of Destruction Light Novel', I can only speculate. There could be a main character who is an outcast or has a special gift that makes them the only one able to approach the gate. Maybe there's a female lead who is strong - willed and has her own motives regarding the gate. There could also be an old, reclusive character who has knowledge about the gate but is reluctant to share it at first. And then there would be the villains, perhaps power - hungry individuals or a cult - like group that wants to use the gate's destruction power to reshape the world according to their twisted ideals.
I assume Okabe Rintarou would still be one of the main characters. Since he was central in the original Steins Gate, he's likely to play a major role in the sequel as well.
The main character is Shin. He is a skilled gamer who gets trapped in the virtual world of 'The New Gate'.
There is also Aoi. She often plays an important role in Shin's adventures, providing support and sometimes a different perspective. Their interactions add depth to the story. Additionally, there are other characters like Eline, who each have their own distinct personalities and contribute to the overall plot in different ways. They all together create a rich and diverse character landscape in the 'the new gate translation light novel'.