To create a compelling OC homunculus, start with its motivation. What does it want? Is it power, acceptance, or something else? Then, think about its relationships. Does it have an ally among the human alchemists or is it at odds with all of them? Also, consider its powers. Make them interesting and related to the Fullmetal Alchemist lore. For instance, it could have the ability to manipulate a specific type of metal in a way that's different from the main characters. And don't forget to give it flaws. A homunculus that is too perfect won't be as engaging.
There are also fanfics where the reader is on a quest to understand the origin and nature of the Homunculus. They might team up with characters from the original series like Edward and Alphonse Elric to uncover the secrets of the Homunculus. Along the way, they could develop romantic or platonic relationships with the Homunculus or the other characters. This type of plotline often delves deep into the lore of Fullmetal Alchemist and can be really engaging for fans who want more in - depth exploration of the series' concepts.
One idea could be exploring Lust's backstory before she became a Homunculus. Maybe she had a human life before and what led to her transformation. Another could be a fanfiction where Lust forms an unlikely alliance with a human alchemist. They could work together to achieve a common goal, like saving a town from a greater evil.
Some common themes include the search for humanity. OC homunculi may strive to understand and possess human qualities, such as emotions and empathy. The theme of family also exists. They could be searching for a sense of family or dealing with the concept of family in a world where they are often seen as outcasts. Additionally, there's the theme of fate. Do homunculi have a pre - determined fate, or can they change it? Fanfictions often play with this idea.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. AO3 has a wide range of categories and tags, so you can easily search for 'Fullmetal Alchemist' and then narrow it down to reader - insert and Homunculus - related fanfics. FanFiction.net also has a large collection, though the search might be a bit less refined.
Their relationship could develop through mutual respect. If they are constantly thrown into situations where they have to rely on each other's skills. For example, in a battle against a powerful alchemist, Lust's combat abilities and Edward's alchemical knowledge could complement each other, leading to a grudging respect that might grow into a friendship of sorts.
Her character could be developed by exploring her moral compass. Since she is a Homunculus, she doesn't have the same moral framework as a human. But what if she starts to question her actions? Maybe she meets a young alchemist who makes her think about the consequences of her deeds.
One interesting plot idea could be that Edward and Lust are forced to team up against a common enemy. Maybe a new alchemic experiment gone wrong has created a powerful and dangerous being that threatens the world they know. Their combined knowledge of alchemy and Lust's unique abilities might make for an interesting dynamic as they struggle to defeat this foe.