There's also 'L and Misa: A Different Perspective'. This fanfic delves deep into their characters. It explores how Misa's adoration for Light affects her relationship with L. It's really interesting to see how L tries to understand Misa's motives and how she might be a key in his investigation.
L's death in the manga occurs as a result of Light's elaborate schemes. Light finds a way to trick L and eliminate him, marking a significant turning point in the story.
In some cases, it could be the environment itself. For instance, if they are in a highly dangerous and unforgiving area, like a collapsing building or a toxic zone, and Ellis makes a wrong move trying to lead the group through, which leads to his death.
Perhaps in the fan fiction, Ellis is bitten while trying to protect a vulnerable member of the group. He then decides to isolate himself to avoid turning and ends up dying alone.
It could be a rogue detective who is jealous of L's fame and abilities. This detective might think that by kidnapping L, he can take over the high - profile Kira case and prove himself to be better.
Some fanfictions might center around Baby L's first encounters with the criminal underworld. They could show his initial reactions to the complex and often dark nature of the crimes he would later be known for investigating.
One common theme is the exploration of L's more private and emotional side. Since he's such a mysterious character in the original, fanfictions often delve into his feelings. Another theme could be the forbidden or secret relationships he might be in, which ties into the 'lemon' aspect, like a relationship with someone he shouldn't be involved with in the context of the Death Note world.
Another theme is the exploration of their personalities. Misa's bubbly and somewhat naïve nature contrasts with L's cold and calculating demeanor. Fanfictions often play with how these two personalities clash and sometimes, surprisingly, complement each other. For example, in some fanfics, Misa's unpredictability helps L in his investigations in unexpected ways.