I do find Setsuna annoying. Especially after watching last episodes. To me he is just a stuck up b*tch who acts all cool and wise but in fact is a murderer and hypocrite. Interesting. I hope he dies
This'd be a big surprise.
But I have a feeling that it is Lockon - my favorite character who'll die... Or maybe they are intentionally making him to be a cliche cool-nice-kind-elder-brother guy NOT to be killed during the anime show. That'd be a surprise, too