As of the latest chapters I've read, Megumi is still alive in the manga. Usually, such major character deaths are significant plot points and would be well-publicized if they occurred.
One of the main themes is the contrast between their personalities. Gojo is more carefree and confident, while Geto has a more brooding and complex nature. Fanfics often explore how these differences affect their relationship. Growth is also a theme. As they face various challenges in fanfics, they grow as characters, both individually and in their relationship with each other. Additionally, the theme of redemption can sometimes be found, especially in fanfics that focus on Geto's character arc.
I really like 'Gojo and Geto: Bonds Beyond'. It explores how their friendship could have developed further if certain events in the original story didn't occur. It's full of emotional moments and great character development. There's also 'The Geto - Gojo Dynamic' which is more of a character study. It analyzes their actions and decisions in relation to each other in a really interesting way.
Typically, megumi fanfic often focuses on his personality traits. His stoicism and determination are often highlighted. For example, in many fanfics, his unwavering resolve in the face of danger is a central theme.
Well, Megumi's story in the manga was full of twists and turns. She had to overcome various obstacles, and there were also some unexpected developments in her relationships with other characters.
Nope, Megumi is alive. The author has chosen to keep Megumi's character alive to continue developing their story and interactions within the manga's world.