Power and its consequences could be a theme. As the character gains power over the decade and becomes a legend, there are probably implications of how that power affects them and those around them. Also, the theme of friendship or relationships might be present. Along the journey to becoming a legend, the character may have made allies or had relationships that influenced their path.
There's 'That Time I Got Reincarnated as a Slime'. In this light novel, the main character, who starts off in a rather unassuming state, gradually becomes a powerful and legendary figure. It shares the concept of growth and achieving a legendary status over time, which could be related to 'I became a legend a decade later light novel'.
I'm not sure specifically as I haven't read it. But generally, it might be about a character's journey to becoming a legend over the course of a decade.
The genre could have evolved to be more inclusive of modern themes. With the passage of 10 years, it may have adapted to the changing tastes of readers. For example, if it was a fantasy genre before, it might now have more elements of science fiction or vice versa.
Tsukasa Kadoya, who is Kamen Rider Decade, is a key character. Then there are the other Kamen Riders from different worlds that he encounters. For example, Kamen Rider Kuuga. Their interactions with Decade shape the story. Also, Natsumi Hikari plays an important role as she is often involved in Decade's adventures and provides a different perspective compared to the more combat - oriented Decade.
One of the main storylines often involves the journey of the Kamen Rider Decade through different Rider worlds. He has to face various challenges and foes specific to each world he visits.
Often, 'Decade Love' light novels would likely have a long - term relationship development. The characters' personalities and their feelings for each other change and mature over time. For example, they might start as strangers or acquaintances and over the years, their love deepens and becomes more complex.
The '10 years later legend light novel' might bring a fresh perspective on the original story. The characters could have achieved their long - term goals or faced new and greater challenges. There could be a new generation of characters that inherit the legacies of the original ones. It could also explore how the passage of time has affected the values and beliefs of the characters and the society in the story.