Death Note explores the blurred line between good and evil through its complex characters, particularly Light Yagami and L. Light starts off with good intentions to rid the world of criminals using the Death Note, but his actions become more morally ambiguous as he descends into darkness. On the other hand, L, who is considered a force for good as a detective, is willing to use questionable methods to catch Kira (Light's alias). This constant shifting of moral perspectives challenges the viewers' notions of right and wrong, effectively illustrating the ambiguity between good and evil.