Hans Rosen functions as a recurring rival driver to protagonist Takaya Todoroki. Their rivalry stems from a race at Fuji Speedway where Takaya defeated Hans. This defeat fuels Hans's persistent drive to outperform Takaya in subsequent competitions. His core motivation centers on surpassing Takaya to validate his own racing prowess. Hans maintains an exclusively competitive role through racing-focused interactions with the protagonist, serving as his professional challenge within the circuit.