Misa Amane from Death Note
The series' female lead, up-and-coming actress Misa Amane, fell in love with Kira and is a staunch supporter of him. She says she would always be thankful to Kira since he saved her from a killer who slaughtered her family.
She met Light (the infamous Kira) and fell in love with him right away. She committed her entire life to aiding him, even if it meant giving up part of herself for the Shinigami Eyes in order to learn L's actual name.
