One factor is the sense of wish - fulfillment. Readers like to imagine themselves in the shoes of a character who can easily overcome challenges. For example, in 'That Time I Got Reincarnated as a Slime', Rimuru's ability to gain new powers so effortlessly is exciting. Another aspect is the ability to change the world around them. An overpowered MC like Momonga in 'Overlord' can reshape the new isekai world according to his will, which is very appealing.
Another aspect is prior knowledge or experience. In some light novels, the MC is reincarnated or transferred from another world. Like in 'Konosuba', Kazuma has knowledge from his previous life which he uses to his advantage in the new world, and this knowledge combined with his unique skills makes him overpowered in certain situations.
A really good overpowered MC isekai novel is 'The Rising of the Shield Hero'. Naofumi is initially treated unfairly but as he progresses, he becomes extremely powerful. His shield gives him unique abilities that set him apart from others in the isekai world. Then there's 'Log Horizon'. Shiroe, the main character, has a great intellect which, combined with his in - game skills, makes him overpowered in the world he's isekaied into. Also, 'Konosuba' has an interesting take on an overpowered MC. Kazuma has some unique abilities, and his party members also contribute to his overall 'overpowered' situation in the comical isekai world.
Some popular overpowered MC (main character) novels include 'Solo Leveling'. In this novel, the MC starts off weak but gradually becomes extremely powerful with unique abilities. Another one could be 'Overlord', where the MC is an incredibly strong character in a game - like world. And 'The Legendary Mechanic' also features a very overpowered MC with great skills and development in a sci - fi setting.
In 'isekai onsen light novels', often the onsen can have special properties. For example, it might have healing powers or be a place where rare items can be found. This makes it an interesting setting within the isekai world. Also, the social interactions that can happen at the onsen, like characters from different races or backgrounds coming together, add to the appeal.
The idea of starting over in a new world is very appealing. It gives readers a sense of escape from their own reality. In 'isekai web novels', the protagonist often gets special powers or abilities which is exciting.
The idea of revenge in 'isekai revenge novels' is appealing because it gives a sense of justice. When the main character is wronged in the other world, readers root for them to get back at those who did them wrong.
The combination of isekai and BL is appealing because it offers a unique setting for a love story. In isekai, there are new worlds to explore, and adding a BL element means exploring a different kind of relationship in that new world.
The idea of having cheats in an isekai novel is appealing because it allows the protagonist to quickly gain power and status. It gives readers a sense of satisfaction as they watch the character overcome obstacles easily.
These novels are appealing as they let readers dream of having an advantage in a strange new world. The smartphone is a symbol of the familiar in the unfamiliar. The protagonist can use it to solve problems, outwit enemies, and create things that the new world has never seen. It also often has elements of self - discovery and growth as the character adapts to the new world while relying on the technology they brought with them, which is very attractive to readers.
The combination of isekai and dragons is appealing because dragons are often seen as powerful and mysterious creatures. In isekai settings, they add an extra layer of grandeur. For example, in many novels, the protagonist might form a bond with a dragon, which gives them great power or access to new areas in the other world.