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.
Naoko Takeuchi has had a huge influence on fan fiction. Her detailed and complex characters in Sailor Moon, for example, have given fans a lot to work with. Fans are inspired by her character designs, personalities, and the overall world she created. This leads to a plethora of fan fictions that try to either continue her story, or put a new spin on it.
Maybe she just wanted to take a break or focus on other aspects of her life. It could be that she felt she had achieved what she wanted with manga and was ready for a change.
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.