Imagine if Lelouch had prepared himself both mentally and physically for his war with Britannia. Lelouch X Harem. Has a TVTropes page!

Touka Kirishima adopts a job teaching creative writing—at a maximum security prison. It is a world she has never experienced before; one ruled by enigmatic codes of honor, ceaseless aggression and absolutely savage violence. But one of the prisoners there is unlike any of the others. [AU where Touka is human and Kaneki is a ghoul. Eventual Touken]

Kaneki was born as a hybrid, an outsider among ghouls and humans, he always believed his life to not be worth living, so when a strange assortment of ghouls from 'Anteiku' including a short-tempered waitress start changing his views and his heart, what is he to believe now? he believed his life would end with tragedy, maybe it won't be so tragic after all. Kaneki X Touka. AU

Kuzen never left Eto in the 24th ward, instead he kept her with him and raised her, so what happens when another half-ghoul is created? A certain Half-ghoul named: Ken Kaneki... Etoken

Kallen wanted to make peace with her past. Lelouch didn't expect to have a future. Together, they might be able to work something out. Post- Zero Requiem. Geassvalentines2017.

The Demon Emperor had succeeded. The world was destroyed, and in the process, saved. However, when he awakens in the World of C, God offers him a deal: Gain a new power and return back to when everything began, back to Zero's birth. They say the smallest of changes to the past can drastically affect fate. Armed with his knowledge of the future, Lelouch sets out to start again.

The sequel to the much esteemed-sorry, I just had to say that-story, Your Past, My Future, this takes place a few months afterwards. Zero has managed to provoke the most powerful man in the world to join the war. Maybe that wasn't such a good idea, but that's the only way that it can end. Lelouch/Kallen and Suzaku/Euphie is the plan.

FF#1 Kallen falls in love with Zero, but she soon finds out that she is being forced to marry Lelouch. Torn between the two how will the truth come out that Lelouch IS Zero?

'I may not regret anything but if fate gave me another chance to redo my revolution, I promised every deity up there in heaven and down in hell, I will do my revolution right this time.' Fate could be cruel, but it doesn't like holding debts. LelouchXKallenXCC

Lelouch suffered defeat, despair, and ultimately betrayal, but when he faces the Emperor, he wakes up before Zero was created. Suddenly in the past, he has the power to remake the future. Time travel. Probably Lelouch Kallen pairing.

Lelouch was quite prepared to die, consigned to going down in history as the Demon Emperor, the target of the world's misery. He wasn't prepared to start over from the begining. LelouchxHarem. Rated T for now.