Onmur
Archangel of Nutella.
But where would we find someone with such a power? It sounds completely gamebreaking, the meguca would've needed to have ridiculous potential before contracting, intimate knowledge about the system, goodwill to wish in such a way that would help others...That's not what this is about.
I'm not saying Madoka was unsaveable, or even that I disagree with what Homura Did.
But in the Madokaverse, friendship ON ITS OWN doesn't get very far. It needs to be backed up by something else.
Like, say, being able to remove Grief from someones soul in such a way as to potentially allow you to break the system without a Madokami Interrupt.
That'd do it.
Impossible. I don't believe it.