While Ryuk takes amusement in everything in the Human World, Rem is almost the exact opposite. She views most humans with contempt. Also, while Ryuk is ambivalent to Light's success or failure, Rem actively assists Misa. This makes her equally as guilty as Ryuk of not displaying 'proper' traits for a Shinigami to have. She is even willing to sacrifice her life to defend Misa, as evidenced by her threat to kill Light should Misa die before her time. For Misa's sake, however, she still assists Light in his schemes.