Irie of course!
He's such a funny character.
I also voted Mion, Rika, and Hanyuu though. Out of the main characters, they were my favorites this season. I would vote Rena, but I like psycho Rena from Onkikakushi/Tsumihoroboshi better. XD
Now that I think about it, I probably should've voted Shion also. I like the Sonozaki twins a lot.