Yagami was the protagonist of the Japanese suspense manga Death Note. He was the son of the police chief, Night God Soichiro, and came from a wealthy family. In the manga, Yagami was portrayed as a perfectionist with a beautiful appearance, all-rounded sports, excellent acting skills, and strong psychological quality. He had superior intelligence and malice, and was considered a perverted criminal. Night God Moon's abilities included an excellent mind and a stable mind. He could design a plan to drive a wedge between the police and the enemy, and he could remain calm while processing a large amount of information. He pursued a new world without crime, believing that the world was decaying. Night Goddess Moon's personality and fate were deeply explored in the Death Note. He was a well-loved character because he represented the possibility of indulgence, but he also experienced many failures.
Light Yagami's death in the manga occurs because Ryuk, the shinigami who gave him the Death Note, decides to end his life. It's a result of Light's descent into madness and his attempts to evade justice.
In many fanfictions about Light Yagami and Misa, their relationship is often complex. Light initially uses Misa for his own ends in the 'Death Note' story. He manipulates her feelings because of her Shinigami eyes which are useful for his plan to create a new world. Misa, on the other hand, is blindly in love with Light. In fanfiction, this dynamic can be explored in different ways. Some might show Misa slowly realizing she's being used, while others may focus on a more 'romanticized' version of their relationship where Light actually develops some real feelings for Misa.
First, understand Light's character. He's intelligent, calculating, and has a strong sense of justice (although his methods are extreme). When making him possessive, show how this new trait fits into his existing personality. For the OC, create a backstory that gives reasons for Light to be possessive. Maybe the OC has some information that Light needs. Then, focus on the relationship development. Use dialogue and internal thoughts to show how the possessive nature affects both characters. For example, Light might say things that are subtly controlling to the OC, and the OC might feel conflicted about it.
I'm not sure specifically which 'Kazuma Yagami' in a light novel as the name is not widely known in extremely popular mainstream light novels. It could be a character from a relatively niche or new light novel series.
A 'harry potter is light yagami fanfiction' story might involve a crossover of the two worlds' moralities. Light Yagami's extreme sense of justice could clash with the more traditional good - vs - evil dynamic in Harry Potter. Maybe Light gets his hands on a powerful magical artifact that he believes can help him rid the world of all wrongdoers. Harry, Hermione, and Ron would then have to figure out how to stop him without fully understanding his motives. It would be a story full of mystery, moral dilemmas, and a battle of wits between two very different characters.
There are a vast number of fanfics on the internet, and given the creativity of the fan community, it's very possible that there are fanfics portraying Light Yagami as gay. Fanfic writers often take characters from their favorite shows or books and put them in new and different situations, including changing their sexual orientation to tell a different kind of story. These fanfics can range from being well - written and thought - provoking to just being a bit of fun and experimentation. So, if you look hard enough on the right fanfic websites, you may come across one.
Ron might be a bit more conflicted. On one hand, he would understand the need to get rid of really bad people. But on the other hand, he would be put off by the cold - blooded nature of Light's actions. He would probably say something like 'There's got to be a better way than just killing them off without a second thought.'
Another theme is the re - imagining of relationships. In the original story, Light has certain relationships with characters like L and Misa. In the fanfics with a female Light, these relationships are often re - evaluated. Maybe female Light has a more complex relationship with L as they try to outwit each other, and her relationship with Misa could be more of a sisterly rivalry or a different form of alliance.
One unique aspect is the clash of different moral systems. For example, when Light crosses into a universe like 'Star Trek' where the Federation has a very different view on life and justice. His use of the Death Note would be highly controversial. Another aspect is the exploration of his character in new settings. In a crossover with 'Fullmetal Alchemist', he would be exposed to a world full of alchemy and different power structures.