[ShyGuy]

Sagara is definitely one of the most interesting mysteries of the show, I'm really interested in eventually learning what his deal is. From what we've seen of him, he mostly reminds me of Kyubey from Madoka Magica in the sense that he's this enigmatic figure that finds individuals he sees as having great potential and tempts them with a power that he provides, and ultimately this power leads to the individual's loss of his or her humanity. Not surprising since they're both from the same writer, but it will interesting to find out what exactly Sagara's motives are.

EDIT: Added spoiler tags just in case there's anyone who might want to avoid Madoka Magica spoilers since what I mentioned is a significant plot point.