I'm not aware of any extremely popular ones specifically named 'isekai uncle' right off the bat. However, there are so many isekai light novels out there that it's possible there could be some that feature an uncle - like character prominently. Maybe there are some niche or emerging ones that are starting to gain a following among isekai fans.
There may not be a widely known and highly popular 'isekai uncle light novel' series at the moment. In the world of isekai light novels, the focus has mostly been on younger characters, like high school students or young adventurers. But as the genre continues to expand, there is a possibility that more stories featuring an uncle as the main character could gain popularity. Maybe in the future, we'll see some new releases that will make 'isekai uncle light novels' more well - known.
I'm not entirely sure as there could be many different 'isekai uncle' light novels. Generally, in isekai genre, it often involves a character being transported to another world. Maybe this 'isekai uncle' one is about an uncle - like character who gets sent to a different realm and has various adventures there, like making new friends, fighting monsters, and learning about the new world's magic or culture.
One popular 'isekai antihero light novel' series is 'Overlord'. In it, the main character is an anti - hero who gets transported to a new world and uses his knowledge and power from the real world in rather self - serving ways at times. Another is 'Konosuba', where the protagonist Kazuma has many anti - hero like qualities as he tries to survive in the isekai world while being lazy and often more concerned with his own well - being than being a traditional hero. And 'Re:Zero' also has elements of this, with Subaru having to face his own flaws and make morally ambiguous choices in the isekai setting.
One popular 'isekai shihai light novel' series is 'Overlord'. In this series, a powerful gamer is transported to a fantasy world where he has incredible abilities and begins to build his own empire. Another is 'Re:Zero − Starting Life in Another World'. The protagonist Subaru has to face numerous challenges in a strange new world and has the unique ability to return by death. And 'That Time I Got Reincarnated as a Slime' is also well - known. The main character is reincarnated as a slime and gradually gains power and influence in the new world.
I'm not aware of any extremely popular ones off the top of my head. But there might be some niche or emerging series in this category.
One popular series is 'In Another World With My Smartphone'. It follows the adventures of a guy who is reincarnated in a fantasy world with his smartphone. The story has a lot of interesting elements like magic, new races, and the protagonist uses his smartphone in creative ways to solve problems and gain power.
One popular 'isekai de tochi light novel' series could be 'Overlord'. In this series, the protagonist is transported to a different world and has to deal with various challenges while also having unique powers related to the land or territory in that world. Another could be 'Re:Zero − Starting Life in Another World' which also has elements of the protagonist making use of the new world's resources and territory in his journey of survival and growth.
There's no easy answer to whether it's popular. Popularity can vary depending on different factors. In the world of light novels, marketing also plays a big role. If the publisher has promoted it well, it might have reached a wider audience. Also, word - of - mouth is important. If early readers found it amazing and recommended it to others, it could have gained popularity. However, without more information on things like its availability in different regions, the number of translations, and its presence in popular bookstores or online platforms, it's hard to determine its overall popularity.
The popularity of 'arafoo kenja no isekai light novel' might be restricted to specific regions or language - speaking communities. For example, it could be highly popular in its country of origin but not so much in other parts of the world. Also, the release of an anime adaptation, if any, can significantly boost its popularity, but I'm not sure if this novel has one.
Another one could be 'Konosuba: God's Blessing on this Wonderful World!'. It's a comical take on the isekai genre. The main character dies a rather embarrassing death and is reincarnated in a fantasy world. It's full of humor as the characters are all quite quirky and their misadventures in the new world are really entertaining.
One popular light novel isekai novel is 'Sword Art Online'. It combines virtual reality and isekai elements. The story follows Kirito as he gets trapped in a virtual MMORPG world and has to fight to survive. Another is 'Re:Zero − Starting Life in Another World'. It stands out for its unique premise of the protagonist dying and restarting from a certain point every time he fails. There's also 'Overlord', where a player gets stuck in a game world as his powerful in - game character and has to navigate the new reality.