Who is that at the end of episode 2? At the end of every episode of Puella Magi Madoka Magica there is an artist's drawing while one of where characters is narrating the next episode preview. In Episode 2 we see this:



Who/what is that behind Homura? And why is he there?
So, uh, this is kind of weird. 

According to a guy on Chiebukuro (which is basically Japanese Yahoo! Answers), the artist of this end card, HIKAWA Hekiru, is a fan of the movie Mad Max 2, and one of the characters in that movie is a dude named Humungus, who is the guy pictured here. 

Also according to the guy on Chiebukuro, Humungus has apparently popped up in other works by Hikawa. I'm not familiar with any of Hikawa's works, so I don't know whether this is actually true or not, but the guy in the endcard certainly does look like Humungus.