Series is over, no more theories.
My list of most annoying characters in no particular order:

http://i59.tinypic.com/2hq3wxh.jpg
http://i60.tinypic.com/2r4szgl.jpg
http://i60.tinypic.com/v3lsfs.jpg
http://i59.tinypic.com/2b7l0w.jpg
http://i58.tinypic.com/6h0uwo.jpg
http://i59.tinypic.com/29wkcop.jpg
http://i57.tinypic.com/51sykg.jpg