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 relationship can develop through competition. They can be rivals in races, constantly trying to outdo each other. Each time they compete, they gain more respect for the other's skills. This mutual respect can then turn into a friendship as they start to see the effort and talent in one another.
One possible storyline could be that they team up for a really tough race. Makishima's strategic mind and Toudou's determination combine to create a powerful duo. They face various challenges during the race, like difficult terrains and tough opponents. Along the way, they start to understand each other's riding styles better and develop a deeper respect for one another.
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.