No. Writing sexual fanfiction about a character like Professor Layton is inappropriate. Professor Layton is a character from a family - friendly game series. Fanfiction should respect the nature and intended audience of the original work, and creating such adult - themed content goes against that respect.
One interesting concept could be alternate universes where the characters have different roles or abilities. For example, Layton might be a villain instead of a detective.
One major ethical issue is the disrespect to the original creators and the intended audience. The creators designed Professor Layton to be a character in a non - sexual context, and by creating sexual fanfiction, it shows a lack of respect for their vision. Also, it can make the fan community an uncomfortable place for those who don't want to be exposed to such adult - themed content.
It's likely a visual novel related to the Professor Layton series. It probably features the same charm, mystery - solving elements, and engaging characters as the main games in the series.
One common theme is the theme of friendship. When Luke is hurt, it tests the bond between him and Professor Layton. It shows how much they rely on each other.
First, you should have a good understanding of the original Professor Layton series. Know the characters, their personalities, and the overall tone of the story. For example, Layton is known for his gentlemanly and intelligent demeanor.
One idea could be to create a story where Professor Layton has to solve a mystery in an ancient, haunted castle. The castle could be filled with puzzles that are linked to the ghosts' pasts.
One common theme is growth. Luke's growth as a character, both in intelligence and in his relationship with Professor Layton. Another theme is mystery - after all, they are known for solving mysteries in the original games.
Puzzles. Professor Layton is all about puzzles, and in the London Life Story, they would be a major part. Also, the unique London setting with its iconic landmarks.