A three-volume novel by Haruki Murakami.Tengo is a writer who, one day, is asked by his editor to rewrite a strange book called Air Chrysalis. Aomame is a girl who once running late for a meeting ends up entering in a emergency passageway that gets her in an alternate dimension. As the novel progresses, the two stories start to merge.Expect lots of postmodernism and Mind Screw.
Abusive Parents: Aomame's parents disown her when she leaves the faith. Fuka-Eri receives abuse at the hands of Sakigake; she is imprisoned in a shed for 10 days as a consequence of dereliction of her duties.
Amoral Attorney: Before being kicked out of the Tokyo Bar Association Ushikawa was a lawyer that helped the yakuza and other unsavory types get away with money laundering and fraud. He had to take such clients mostly due to the difficulties his ugliness caused in getting normal clients.
Black and Gray Morality: Aomame is an assassin, but she only kills men who have been abusive and "despicable". As goes with the Madame who gives Aomame her assignments. Komatsu displays a more self-serving morality.
Chekhov's Gun: Discussed at length regarding an actual gun. Ultimately subverted, as the gun is never fired.
Cyanide Pill: Aomame holds onto a gun given to her by Tamaru, should the need to use it arise in the course of her mission to kill Leader. See Chekhov's Gun.
Expy: Ushikawa, a rather weird, ugly man who works for the Big Bad and goes on at length about his own contemptible qualities, is very similar to a character also named Ushikawa in The Wind-Up Bird Chronicle.
Not So Stoic: Ushikawa prides himself on being detached from connections with others and emotions. But his commentary makes it clear that he deeply misses his ex-wife and two daughters. As he dies he thinks of them.
Now Do It Again Backwards: Aomame and Tengo are able to escape the world of 1Q84 by climbing back up the emergency escape ladder Aomame climbed down when she entered it.
Omnibus: Originally published as three separate volumes, the English release combined all into one really big book.
Oedipus Complex: Tengo struggles with his father, and convinces himself that the man is not his biological father. Tengo overcomes his father by reading to him, while he is in a coma. (Taking on a role-reversal of sorts, but also allowing Tengo to self-reflect, almost at his father's expense). In the same place, the town of cats, Tengo spends the night with one of the nurses, Kumi Adachi. He does not sleep with her, but he smokes hash with her and has a vivid memory of her luxuriant pubic hair (a sign of maturity). Later on after Tengo's father passes away, it is hinted that Kumi may be the reincarnation of Tengo's mother, though Tengo himself never comes close to making this connection.
Pun-Based Title: The title is a pun on 1984. The number 9 in Japanese is pronounced the same as the English letter Q.
The Red Stapler: Janácek's Sinfonietta became more popular after the release of this book.
Sadistic Choice: Aomame can either kill the leader, causing the Little People to lose any interest in Tengo but result in Sagikake coming after her, or let him live, in which case the Little People will arrange Tengo's death.
She ultimately chooses to kill the leader, but the effects don't get explored in time.
The Stoic: Fuka-Eri never shows emotions. This is because she was separated from her dohta at a young age, a dohta being revealed as the shadow of one's heart. She isn't the cliché shell-of-a-person zombie-like character in the absence of her shadow; she still has a semblance of personality. Murakami has a unique conception of a person's shadow, which appears in other works. See 
The Rat: Averted. The only people who know about Aomame's assassinations are Tamaru and the Madame herself. While one might be able to expect Aomame being ratted on, instead she becomes part of the Madame's protected 'family'. Tamaru shares with Aomame a story of his past involving a half-black half-Japanese child in his orphanage carving rats out of wooden blocks. He uses the term, "pulling the rat out" of the blocks of wood. The author also pulls the possible rat from the story
Three Lines Some Waiting: Books 1 & 2 are Two Lines, No Waiting with Tengo and Aomame, but Book 3 introduces Ushikawa. Ushikawa's plot line runs slightly behind the plot lines of of Tengo and Aomame's. Some events are re-told later in the book, from Ushikawa's perspective.
Threshold Guardians: The Esso Tiger on the billboard on the expressway where Aomame enters 1Q84. He is seen multiple times, kind of acts as a gatekeeper since he is present at the gate to parallel dimensions.