I'm not sure exactly as I haven't read this light novel. But generally, 'isekai' often involves a character being transported to another world. Maybe the'shounin yuusha' (young merchant hero) has some sort of adventure or growth while making their way in this new world of 'isekai' that the novel is set in.
Given the title, the most prominent character should be the shounin yuusha. However, in an isekai story, there are usually other important characters too. There could be a mentor figure who helps the young merchant hero understand the ways of the isekai world. There might also be antagonists, perhaps other merchants who are jealous of his success or local villains in the isekai world who try to stop him from achieving his goals. But again, this is just a guess without having read the actual light novel.
Since I haven't read this light novel specifically, it's hard to give a detailed account. However, based on the words, it seems that the story might revolve around a male protagonist (shounen yuusha). The 'isekai wo gyuujiru' part could suggest that he has some sort of extraordinary ability or mission related to the other world (isekai). Maybe he's on a journey to conquer or understand this new world, which is a common theme in light novels.
I'm not sure specifically as I haven't read this novel. It might be about a young hero ('shounen yuusha') who is involved in another world ('isekai') in some way related to 'gyuujiru' which might be a special action or concept within the story.
One could be 'Overlord'. It also has a male protagonist in an isekai setting with a lot of power - much like what the title 'shounen yuusha wa isekai wo gyuujiru' might imply. Another could be 'Konosuba'. It has a young male lead in an isekai world, though the tone is more comical compared to what we might expect from the given title.
Since we don't really know the details of 'shounen yuusha wa isekai wo gyuujiru novel', it's a bit of a stretch to recommend similar ones precisely. However, in the isekai genre, 'Re:Zero − Starting Life in Another World' is well - known. It has a young male protagonist who has to face many difficulties in an isekai world. Also, 'Konosuba: God's Blessing on This Wonderful World!' has comical elements along with the isekai setting which could potentially be somewhat similar depending on what 'shounen yuusha wa isekai wo gyuujiru novel' is really about.
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.
Well, 'yuusha party wo tsuihou light novel' could potentially tell a story full of drama. Since it involves a hero being expelled from a party, there could be a backstory to that expulsion. It might be due to a misunderstanding, or perhaps there are power struggles within the party. The hero then might embark on a journey to prove himself or find a new purpose, with various characters and events along the way.
Since I haven't actually read this light novel, it's hard to say precisely. However, based on the title, it seems that the main focus could be on a hero who has been cast aside. The 'kitakuchuu' in the title could be a crucial part of the story, perhaps it's a place full of mystery and danger. The hero might have to use their skills and wits to survive in this 'kitakuchuu' while also dealing with the emotional baggage of being suterareta. It could also explore themes of redemption and finding one's place in the world again.
The 'Suterare Yuusha wa Kitakuchuu' light novel could potentially be about a hero who has been rejected or left behind. Maybe in this northern area ('kitakuchuu') he has to face all kinds of difficulties. He might have to fight against powerful enemies, both physically and in terms of his self - confidence. It could also be about his attempts to find his place in a world that has seemingly turned its back on him. It may also involve some interesting magic or special abilities that are unique to this world.