Light Yagami's god complex, stemming from his belief in his own superiority and desire to control others, greatly impacts his relationships with other characters in the series "Death Note." His god complex leads him to view himself as above others and as a judge of morality, causing him to manipulate, deceive, and ultimately harm those around him. This complex drives a wedge between him and characters who question his actions or stand in his way, such as L and his own family members. Light's god complex ultimately isolates him and damages his relationships, leading to his downfall in the series.