What if the super strong witch is Madoka from the future? Just a random thought.

Kyubey is easily my favorite character in this show, followed by Homura.

I love her name, voice, character type (reminds me a lot of Chikane from KannaMiko, the strong yuri vibes help), power, and design. This is surprising because despite all this I still like the cold logical avatar more. I don't see him as evil at all. Everything he says and does makes sense.

I hate Madoka right now, but she may turn that around if she becomes really bad ass after becoming a puella magi.

I actually like the entropy explanation. I think it's pretty original.