Cersei Lannister
While she may have been becoming a bit frightened of the sociopath she raised, Cersei loved the little monster and wouldn’t do anything to hurt him, right? Motherly love aside…Cersei was no longer able to control Joffrey and she hated the fact that he was marrying Margaery. With Margaery as the new Queen, Cersei’s power base would be taken away from her. She’d no longer be the Queen or even the Queen Regent, Margaery would be the most powerful woman in King’s Landing and Cersei definitely wouldn’t like that. So killing Joffrey before the marriage was consummated effectively removes Maergery from the throne and puts Cersei back in control as Queen Regent until Tommen (her youngest son) was ready to rule.
Crustula 
Ha its not a small list 😀
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Probably could add all of King’s Landing to the suspect list to be honest.
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Having read the books I know who killed him and that person is indeed on your list.
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I am still wondering if the show will try to throw some curveballs and change things up this season.
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Not a spoiler since we just saw it: If i reemmber correctly, there was zero mention of Theon in Storm of Swords, it wasn’t until the later books (not sure if it was feast or dragons) that you get introduced to some character named Reek and learn later on that it’s Theon. Same deal with Asha, no mention of her at all in the book. I thought it was a cool drop for the book nerds to end off with Ramsay coming up with Reek
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I have to admit to enjoying the liberties the show has taken with the books…I am not that big of a hardliner when it comes to adaptations I guess.
And Martin had a bit of a penchant for taking characters we know and having them function under aliases for long stretches without letting the readers in on just who they really were. That definitely wouldn’t work as well on TV.
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