Absolutely Deranged Crossovers That You Wish Someone Would Write Already

Kingsman and Zootopia. A certain down-on-his-luck fox calls a number on the back of a medallion he's had since he was a kit, and gets drawn in to a world of action-packed intrigue. Nighthowlers are just the beginning of the world's problems...
 
Kancolle/Shadow of Mordor. The Shipgirl incarnation of the battleship Charles Martel is defeated in battle, but is banished from death (because French pre-dreadnoughts are so ugly that the seabed rejects them out of disgust) and subsequently gains the powers of the Gravewalker.

On a more serious and cynical note, Kancolle/Uber. Told mostly from the perspective of Abyssals who witness the horrifying power of a new, very different "human battleship" in action, maybe also side-stories from the human/Shipgirl perspective analysing the impact of Ubers on society.
 
Deadman Wonderland and Future Diary would be an interesting cross, if verging on completely fucked up.
 
On a more serious and cynical note, Kancolle/Uber. Told mostly from the perspective of Abyssals who witness the horrifying power of a new, very different "human battleship" in action, maybe also side-stories from the human/Shipgirl perspective analysing the impact of Ubers on society.

Alternatively, KanColle/Uber. With the Abyssals defeated, the shipgirls must find a way to fit back into normal society by providing piggy-back rides personalised sea transport as coordinated by a new technology startup.
 
Shimoneta/Seitokai Yakuindomo: Not only was the even more oppressive monitoring system defeated in the Diet in a surprise upset, but thanks to scientists' statistics of plummeting birth rates going viral, the entire public decency law was overhauled. The message was clear - sex education would be priority number one. One of the schools with the loosest enforcement of the law (thanks to one impassioned teacher who sheltered the students) would send student ambassadors to the school that formerly held the strictest standards of public decency.
 
Shimoneta/Seitokai Yakuindomo: Not only was the even more oppressive monitoring system defeated in the Diet in a surprise upset, but thanks to scientists' statistics of plummeting birth rates going viral, the entire public decency law was overhauled. The message was clear - sex education would be priority number one. One of the schools with the loosest enforcement of the law (thanks to one impassioned teacher who sheltered the students) would send student ambassadors to the school that formerly held the strictest standards of public decency.

What?
 
I would love to see a Beserk X Evangelion crossover where post-series Shinji and unit-01 are transported to the Beserk universe, post-eclipse.
 
Exalted/WH40k. Infernal. Angry. Marine. Specifically, giving Moarfistin a Slayer Exaltation. Poor, poor Chaos Gods.
 
Fallout/(Bethesda) borderlands. They're both overrun by mad max-ian bandits, mutated monsters, and bizarre Science! shenanigans. Not to mention "Heroes" who are kleptomaniac murder hobos, who as Jack pointed out, ate barely better than bandits themselves.
 
Not sure if anyone mentioned it, but JoJo's Bizarre Adventure/Sailor Moon. Somebody make that. Or, if not that, make JoJo's Bizarre Adventure/Pokemon. Because it'd be hilarious to see huge muscular men with cute Pokemon.
 
God of War 2017/RWBY crossover. Because canon world origin myth is garbage. Fan theory holds that Mistral is heavily inspired by Greco-Roman architecture. Mostly due to Pyrrha's Achilles references. Kratos has calmed down over the centuries, and has taken the position of headmaster at Haven academy.
 
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