Rem is the Shinigami who gives you one of the Death Notes she had. She's able to sacrifice everything only for your sake without hesitation as well as see through others intentions but not bother with it too much. Although Rem doesn't understand why you would even love someone else, she doesn't force her standards on you and is highly empathetic. She has strong and unwavering morals, as well as a strong conviction to protect the ones close to her.