Sacrificed not only himself for his cause, but also his loved ones and, perhaps, his sanity.

*Spoiler Alert* I chose Rem because she killed Watari and L just to protect Misa. She also knew it would result in her own death. She also followed Light's plan with Higuchi which ultimately ended up in her death. btw I would say her cause is protecting Misa.

Obviously.

One thing is to fangirl, and another is to kill for attention. If a person doesn't love you. Move on. And try to fall in love with someone worth your while. I don't hate Misa, but it's sick; to see many fangirls view this as acceptable. Sure, I've obsessed myself, but not enough to knock on his door and be ready to jump on his cock.

If Light asks her to jump off a cliff, then she will
do it without hesitation.

He caused EVERYTHING. Like that wasn´t already enough xD

He started to and tried killing many and many innocent people, hoping to make the world a more peaceful and safe place to live. But ended up going insane and psychotic once getting the role and power of playing"God," I mean honestly, who wouldn't?