You are Homura Akemi. You've reset to the 16th again. How do you stop Madoka from becoming Meguca? How do you save her from suffering?
>Madoka I know this is sudden but I'm going on vacation in France to see some relatives! I want you to come with me. We'll see the Eiffel tower, eat at fancy french restaurants, and totally not suffer from french disillusionment like all the other Japanese people! Will you come with me?
>Trying to stop some idiot from becoming some sacrificial hero
Kill Mami Tomoe. That way, as long as she stays on top of QB, both Modoka and Sayaka won't get roped into the whole mahou shoujo deal. Party up with Kyouko to defeat Walpurgis.
Heresy, I'll be a hero of justice! Bitches don't know about my IDEALS. How about yours?
Reveal to the girls the fucking truth about Kyuubei's "hidden agenda" in making people get thewir one wish. Tell Sayaka the bastard will never love her and tell her to tell him to fuck himself.
THEN steal some fucking nukes and waste walpurgisnacht witch before it even enters the fucking city/country/whatever.
>How do you save her from suffering?
Nakama is already obsolete. Only the power of Love will prevail