Megumi Kato is a character in the light novel. She often has certain characteristics and a role to play within the story of the light novel. However, without more specific information about which particular light novel she is from, it's hard to go into great detail about her.
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.
The Aldini brothers, especially Isami, could be good characters to include. They could offer a different cultural perspective on cooking, and Isami's support of his brother Takumi could add some family - like dynamics to the fanfiction. Plus, their unique cooking skills could contribute to the overall story.
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.