Ok, here it is. The percent isn't the odds of death, but my confidence level that the character will survive relative to the character that I believe most likely to live. Also, I'm ignoring series finale possibilities.

100% - Tyrion Lannister - Why: ~Dinklage~PeterDinklage~PeterDinklage~PeterDinklage~

95% - Cersei Lannister - Why: Everyone loves to hate bitchface. It's hard to make a bitchface when you're dead.

95% - Jaime Lannister - Why: He's another Lannister and an antagonist from the beginning of the series. Who could really replace him?

85% - Catelyn Stark

95% - Daenerys Targaryn

80% - Littlefinger - Why: He overextends and monologues a bit too much for all the plotting he does. His charisma is keeping him alive more than anything.

60% - Ser Jorah - Why: Having so much loyalty to dragonlady, with the reasoning being that it would be for the greater good for her to rule makes him pretty killable. Throw in a longer lasting romance conflict and it would be convenient for him to die.

100% - Jon Snow - Why: The glorious Peter Dinklage bestowed upon Jon plot armor in his sympathies for him being a bastard.

90% - Tywin Lannister - Why: I suspect he would be the first of the Lannister quad to fall, with all his lineage babble.

30% - Ser Davos - Why: Anyone with a connection to creepy fire witch is probably gonna get burned or something.

100% - Bran Stark - Why: (see Jon Snow)

85% - Robb Stark - Why: His ambition is going too well right now, but Winterfell getting fucked up will probably bring his karma back into balance.

90% - Sansa Stark - Why: How many important children have died in this show anyway? Gotta keep 'em alive for an 'All Grown Up' franchise knockoff.

95% - Arya Stark

35% - Theon Greyjoy - Why: Wow, he turned out to be a real cunt. Starks have a hard time actually killing their enemies though.

80% - Sam - Why: Because he's the least probable person to survive the wall. This makes him a bit more probable to survive the wall. Also, Jon Snow needs a relatable peer.

80% - Joffrey - Why: What an enormous fuckwad. I wouldn't be surprised if he matures a bit, as it was made clear after the wolf incident that Cersei is responsible for his behavior(even though she denies this later)

40% - The Hound - Why: Unintentionally heroic character that received relatively small character development.

05% - Stannis - Why: Don't put your dick in crazy. Or cult witches that give birth to demonic shadow assassins. And definitely don't do it while threatening anyone with a confidence level of 90% or higher.

40% - Melisandre - Why: I dunno, if she disappears into a cloud of red demon smoke, does that count as dying?

45% - Bronn

65% - Varys - Why: He competes with littlefinger in his role, and is the more careful of the two. His schemes seem to have further reach than Littlefinger as well. I think he might bite off more than he can chew.