I'm not sure if there are extremely popular 'Mutagen Light Novels' specifically. There are so many light novels out there that it's hard to keep track of all of them. However, if it has an interesting concept like mutagen - related stories which can be really engaging in the science - fiction or horror genre, it might have a niche following.
A Mutagen Light Novel could potentially be about a post - apocalyptic world where a mutagen has been released, either accidentally or as part of some experiment gone wrong. The main characters might be survivors who are either affected by the mutagen in different ways or are on a quest to stop its spread. There could be different factions in the story, some trying to control the mutagen for their own purposes, while others are fighting against it. And the story would likely be filled with action, drama, and the exploration of human nature in the face of such a catastrophe.
The unique element is the mutagen concept itself. It allows for a departure from the traditional magic in the Harry Potter series. For example, it can create new magical abilities or change the existing ones in characters.
Well, Naruto and Sasuke are among the top. But also, Kakashi can be quite popular in these fanfictions. His sharingan and his role as a mentor could be greatly influenced by the mutagen. He might gain new abilities or have to deal with his students in a completely different way. Another character could be Sakura. Her medical ninjutsu might be enhanced or altered in strange ways because of the mutagen, which makes her an interesting subject in these fanfictions.
One interesting concept could be the new powers that characters gain due to the mutagen. For example, Naruto might develop some unique jutsu or physical abilities that are a result of the mutagen's influence. Another concept could be the altered relationships between characters. Maybe the mutagen causes some characters to be more distrustful or more united in a different way than in the original Naruto story.
In the traditional TMNT universe, male turtles like Leo getting pregnant goes against the biological norms of the franchise. However, in fanfiction, anything can be reimagined. Some fanfiction might use magic or some out - of - the - box concepts to make such a situation possible, but it's not part of the official TMNT lore.
In this fanfiction, the TMNT might escape by first observing their captors' routines. If the Shredder has minions guarding them, they could wait for a shift change or a moment of inattention. Donatello might be able to hack into any security systems if there are any. Also, they could use their knowledge of the sewers to find a way out. Maybe there's a hidden passage that the Shredder doesn't know about. And of course, their ninja skills would come in handy for sneaking past guards and making a quick getaway.
In the fanfiction world of 'Harry Potter mutagen', there's a story that delves into how a mutagenic spell affects Hogwarts. The spell was initially created for good but has unforeseen mutagenic effects on the students and the school itself. Another interesting one focuses on a character who discovers a mutagenic artifact. This discovery leads to a whole new adventure as they try to understand and control the power of the mutagen while also dealing with the usual Harry Potter - like threats from dark wizards and magical creatures.