[Decagon]

Glasses. Even when fighting, glasses. Even when making pipe bombs, glasses.

Spoiler for spoilers ofc. read if you're impatient:

Almost every loop before, Madoka's been a MG fighting alongside Mami before Homura came along.
Madoka seemed to have more confidence and a stronger will in the timelines when she became a MG. Maybe this was because Homura was comparatively meek in those timelines.
Homura becomes cold like her current character after Madoka asks her to help her avoid being tricked by QB in future timelines, then asks Homura to kill her soul gem before she becomes a witch.
It seems guns can destroy soul gems. So much for being tough, protective containers.
After getting the energy from turning Madoka, QB doesn't need humanity anymore. He basically says dealing with witch Madoka is humanity's problem, not his. So much for the greater good huh?