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.
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.
A fanfic about Aizawa Kousaku and Shiraishi Megumi could be an exploration of their relationship. It might start with how they meet. Maybe they meet in a school setting, where Aizawa is the quiet, studious type and Shiraishi is the outgoing and friendly one. The fanfic could then develop their friendship, showing how they gradually understand each other better.