As much as many people hate a good portion of them, it cannot be argued that the Lannisters aren't at least interesting. They have all sorts of issues that are just nutty! They sleep with each other, they kill each other, they drive each other to suicide...but at least they always pay their debts, I guess.
There has been a big shift with the Lannisters though since daddy Tywin was murdered by his "imp" son Tyrion. Tyrion has always been the rebel and the smartest of his siblings. But now we find that Jaime might be coming around, and may actually choose to stand on the side of good officially. That's fun. And since Cersei has blown up an entire building full of people, and driven her only remaining child to throw himself out of a window, she's been going a little more nutty than normal (which is bad).
Either way though, there are some compelling and ridiculous fan theories about this monstrous family that are worth reading about. Will Jaime finally hook up with Brienne? Who will kill the other first: Jaime or Cersei? Is Tyrion actually a Targaryen? Will Tormund be step daddy to Jaime's future kids? All sorts of weirdness from the Lannisters. As expected.
15 Brienne And Jaime Have Babies!
I think a number of people have been waiting for this to come to light for a long time now. There has always been a tension between Jaime and Brienne. To be fair, that tension hasn't historically been because of an attraction. I think a lot of it has to do with Jaime being the Kingslayer, and responsible for a lot of the terror that happened with the Starks. But that's beside the point. It's clear now that there is a love of some sort. And a tension that these two just can't deny. They want each other. That might just be because Game of Thrones runs on HBO, and everyone has some fun naughty time on that network. But that doesn't change the fact that fans are likely right. There will be some exchange of love between these two before the end.
14 Robert Strong Kills Jaime
This can't be a shocker at all. At least not that a fan has a theory about it. There will come a time where Jaime and Cersei will have it out, and he will likely try and kill her. Why? Because Cersei is absolutely batsh*t insane. No question there. Some fans think that Robert Strong (AKA Gregor 'The Mountain' Clegane) will step in and just obliterate Jaime. Of course, for every fan who thinks Strong will kill Jaime, there is another fan who thinks that this will be the moment when Sandor 'The Hound' Clegane steps in and finally has that big "Clegane Bowl" everyone keeps dreaming of. A lot of people really don't want Jaime to die anymore, so it's more likely that he will...but if it brings on that epic battle between the Clegane brothers, then I say "let's do it"!
13 Arya Takes Jaime's Face
"Taking the valonqar theory one step further, fans think Arya will use her skills as No One to travel to King’s Landing and kill Jaime Lannister. Once she does this, she will make a mask of his face and impersonate him, catch the queen of the Seven Kingdoms off guard, and slay her." this would be absolutely amazing! I seriously doubt that this is how things will end for Jaime and Cersei, but it is entirely possible. After all, Jaime is heading back north toward Winterfell to fight off the undead army. And it's not like Arya doesn't have good reason to hate the guy. He is on her list after all. And imagine the look on Cersei's face when "Jaime" puts a blade through her. This would be a tragically awesome way for the Lannisters to finish off their reign.
12 Jaime Is Azor Ahai
"In the show, it seems like most of the evidence linking Jaime to Azor Ahai is still to come. For example, his near death experience in the lake could be his rebirth amidst smoke and salt — the smoke of Drogon's fire and the salt of the water. Blogger Dorian the Historian pointed out that the red star of the prophecy need not be literal, either; it could refer to the sigil of House Martell, which is a red sun. The red sun bleeding could be the murder of Elia Martell during sacking of King's Landing..." It's an interesting theory, for sure. And if he needed a Nissa Nissa in this story in order to remake Lightbringer...would that mean that he would plunge his sword into the heart of Cersei? Even if this theory is incorrect, that is still a great thing to think about.
11 The Iron Bank Makes The Lannisters Pay
"Tywin was no fool and he knew that while the Lannisters were in debt to the Bank, the Bank had a vested interest in their success. By paying the debt in full Cersei has allowed Tycho to wash his hands of the Lannisters altogether. After what we saw on the battlefield we have a good idea whose position is strongest and who the Bank would like to back. This clearly contributes to the dire situation in King's Landing with no grain and limited supplies. She will not Abdicate, instead force the dragons to destroy the city at which point the Kingslayer will be the Valonqar most assume he will be. The irony of this theory is in this case the Lannisters are undone by paying their debt." I love the idea that the Lannisters are put down because they always pay their debts. I hope this is what happens in the end!
10 Cersei Dies In Childbirth
"When Cersei Lannister shares her "good" news with Jaime that she's pregnant again during the tense fifth episode of Game of Thrones' seventh season, it's safe to say that plenty of jaws dropped (including Jaime's). While some fans are grossed out by the idea of another potential baby Joffrey (and the incest involved to create him or her), others doubt there's a pregnancy at all — it would be so like Cersei to play Jaime like that. While both of those points of view are valid in their own way, there's a third option to consider: Cersei is indeed pregnant, but the baby will be what finally kills her." Her prophecy does suggest some good reasoning that she may not end up being murdered by anyone, but that she will simply die in childbirth. And I have to say, that would be a pretty poetic way for her to go out, at least in Tyrion's eyes.
9 Jaime Dies In Brienne's Arms
"One Reddit user posits that when Jaime told Bronn in Season 5 that he wanted to die “in the arms of the woman I love,” that woman will not turn out to be Cersei but Brienne.
Even if the show never presents Jaime’s love for Brienne as romantic, he definitely loves her. This makes sense as a surprising turn of events — Jaime would still kill his sister and lover Cersei, tragically becoming a Kingslayer twice-over. But he’d then fall in battle or be taken out by Cersei’s guard, the Mountain, drawing his final breath in Brienne’s arms." This would perhaps be the most wonderful way for Jaime to buy it in the end. At least he'd have time to look on Brienne once more. And who knows, maybe she'll have his kids...and then maybe Tormund would become the step dad?
8 Tyrion Targaryen?
"Tywin also unfairly detested Tyrion for murdering Joanna. Throughout Game of Thrones, we’ve seen the Lannister father tell Tyrion "You are no son of mine” multiple times, most notably before being shot with a crossbow. Some fans believe Tywin’s words to be literal, the Lannister believing Tyrion may actually be Aerys Targaryen’s son." Maybe Tywin knew something that no one else did about how Tyrion came to be. Is he actually Aerys son? He seems to have a pretty easy time hanging out with the dragons. That's certainly a step in the right direction. And his knowledge about dragons is incredibly extensive. To be fair, he does know a lot of things about a lot of things, but it would be pretty awesome if he turned out to be the bastard kid of Aerys Targaryen.
7 Sansa Becomes The Mad Queen
Sophie Turner said it herself! "They’re both so family-obsessed and family-oriented, and will do anything for the people they love. I can totally see her becoming a Cersei and kind of driven mad by it, by the threats against her family. At the end of the day, that’s why she does the things that she does, because she’s terrified of losing the people she loves. And so she’ll stop at nothing to protect them. If that means becoming like a ruthless killer, leader, sadistic woman or evil lady, then so be it. I don’t think it matters to her, and I can see Sansa swinging that way too." They already share similar hairdos! How amazing would that be, if Sansa just went nuts like Cersei? After all, Sansa does specifically say in the show that she learned a lot from the crazy queen.
6 Gendry Is Actually Cersei's Kid
"In season 1’s “The Kingsroad,” Cersei visits Catelyn Stark during Catelyn’s vigil at the bedside of her son, Brandon, whom Jaime had attempted to murder. She offers her sympathies to Catelyn and speaks of her first born son, a “black-haired beauty” who died shortly after his birth. In the books, Cersei never mentions any child besides the three she had with Jaime, so we’re restricting ourselves to the show here. Could this child have been Gendry?" Could it be possible that Cersei simply banished the kid and labeled him as a bastard because he wasn't one of the love children of Cersei and her brother Jaime? I wouldn't put it past her. Why else would they throw a detail like that into the show that doesn't exist in the books!?
5 Tyrion The Time Traveling Fetus?
This is probably the most ridiculous GoT fan theory of all "Using Drogo’s soul, Mirri transports Rhaego-the-fetus back in time where he’s delivered by an already-pregnant Joanna. Joanna’s fetus (fathered by Tywin/Aerys) doesn’t make it. Collateral blood magic causes this fetus to resemble Rhaego, and it begins to decay. After “being dead for years” Mirri sends it back to the future, and delivers it from Dany’s womb. Back in the past, Rhaego gets named Tyrion. Tyrion lives as a Lannister for over 34 years. Even though he has already killed/absorbed his biological father Drogo, Tyrion kills his adoptive father Tywin for sh*ts. Tyrion returns to Dany to complete Mirri’s prophecy: “then [her husband] will return, and not before.” Tyrion marries Dany, his mother. Oedipus gets Rex’d. The world shutters as Tyrion begins to mount it."
4 Jaime, Cersei, And Tyrion Are Aerys' Bastard Kids
"Mad King Aerys, Daenerys’s evil father, had more than a flirtation with Tyrion’s mother, Joanna Lannister. In fact, there’s evidence to support the idea that they were either lovers in the time before she married Tywin Lannister, during her wedding night to Tywin, or in the time immediately after. It’s even been suggested that Tywin so loathed Tyrion not just because he was a dwarf or because his birth resulted in Joanna’s death, but because he wasn’t 100 per cent sure he was his own child." What if this was the case for all three of these siblings!? It would certainly explain why Cersei is so incredibly crazy! It would also explain the strange love affair that Jaime and Cersei have. Strangely, Tyrion is the odd one out here, other than being able to calm dragons.
3 Jaime Has PTSD
"Given this, it’s hardly surprising to see Jaime visibly suffer as he watched the Mad King’s daughter burning men to a crisp on the battlefield on ‘Spoils of War’. We see the horror in his eyes as he sees his worst nightmare play out all over again. Daenerys may not be her father, but Jaime does not know that. In this instance in particular, she is exactly the same. She is a danger not just to him and Cersei, but to everyone in Westeros, and she has to be stopped." It's amazing to think that Jaime is suffering from PTSD in that moment. He recalls the fire and the death during King Aerys' reign, and he has to stop it at all costs. I happen to think he was riding just to finally be put to rest. Because if he didn't get pushed into the lake, he knew he was going to be consumed by flames.
2 Jaime Kills Cersei
"Maggy's prophecy also includes the line, "And when your tears have drowned you, the valonqar [High Valyrian for 'little brother'] shall wrap his hands about your pale white throat and choke the life from you." While it's widely thought to be a reference to Jaime eventually strangling Cersei (they're twins, but he was born a few seconds after her, making him her little brother), maybe Maggy's prophecy isn't as cut-and-dry as it first appears. What if, instead of literally being choked by Jaime, Cersei miscarries her fourth child and dies from the complications?" The pregnancy thing is possible, but looks where the two are standing on that map. Cersei at The Neck, and Jaime at The Fingers...this looks pretty symbolic of someone reaching out to strangle another (even if just with one hand).
1 Cersei's Power Haircut
"The notion that Cersei might have a very good reason to choose to keep her hair short has, seemingly, not occurred to even the most engaged Game of Thrones writer. Hot takes on the regal pixie have ranged from the ponderous (“we need to be reminded that she is Permanently Scarred By What Happened”) to the facetious (“Cersei is stuck in some kind of head-related time warp, and while everyone else is allowed to change, her hair is stuck in time”)." Some strange theories there, but there is some good reasoning behind her short cut. First, it is reminiscent of Joffrey. Second, it shows more power. How? It allows for better-suited war-time wardrobe. Rather than the pretty dresses, Cersei has opted for a more armoured, battlefield look. She's losing power so she must show that she has some.