Who is Denny's best friend, apart from Enzo?

Denny's best friend apart from Enzo is Mike. Mike serves as a significant character in Denny's life, offering support and camaraderie during tough times, particularly as Denny navigates the challenges of his racing career and personal struggles. Their friendship is pivotal as it illustrates Denny's relationships outside of his immediate family and highlights the importance of social connections in dealing with adversity.

In the context of the story, the choice of Mike as Denny's best friend underscores the themes of loyalty and support, which are central to understanding Denny’s journey. The other characters, while present in Denny's life, do not hold the same level of significance as Mike in terms of their friendship dynamics throughout the narrative.