Both Hollywood and anime have traded notes for years, spawning The Matrix, Kill Bill, and a Japanese remake of Unforgiven, to name a few. There aren't many TV shows that follow this pattern, but you can see how American movies could be made into anime. In the same vein, TV show anime adaptations could also work. In fact, they're already designed for television, so they'd probably be even better.
American TV and Japanese animation share more than the same broadcast medium. Angry teens with special powers, wacky humor, and over-the-top fight scenes are present in both. Anime also doesn't shy away from mature themes, so incorporating crime or baby mama drama wouldn't seem out of place. Also, some shows would definitely benefit from animation. Everyone's seen cheesy effects in live action that would not only look better if animated, but totally bad ass. There are plenty of American shows that could be great anime series given the right conditions.
An alternate universe, a super-powered lab escapee, and kids who have the fate of the town resting on their shoulders. Out of all the American shows that could be anime series, Stranger Things might be the most easily adaptable. Heck, the Duffer Brothers (the show's creators) even cited Elfen Lied as one of their inspirations.
That doesn't mean everything would translate well to animation, but anime does have a gift for creepy and gross monsters. Not that they need to go full-on Tetsuo from Akira. You never go full Tetsuo.
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You can't go wrong with hot girls and guys kicking (or kissing) vampire ass. People who have seen Blood C may beg to differ, but Buffy knows exactly what it wants to do. It aims to be campy and fun and it delivers. Sure, the older mentor adds some sobering reality, but that gets quickly drowned out by awesome fight scenes and cheesy sound effects.
Said scenes would look way better animated (or at least not as silly) and provide some gravitas to the property. Speaking of fight scenes, if they could blend the best of Hellsing and Vampire Hunter D, it would go down as one of the best action series in anime history.
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With the passing of the manga creator, it's unlikely that the High School of the Dead anime will get a second season. Even so, audiences are pining for a zombie apocalypse anime that's a bit more serious. An adaptation of The Walking Dead would satisfy all parties, as it has both depth and sex appeal. There's no guarantee that this incarnation would summon the power of “Matrix boobs,” but we can always dream.
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American Horror Story is equal parts grotesque and psychologically horrifying, which are two of anime's fortes. Also, it offers a good blend of adult and teenage characters, something that anime needs more of. Viewers aren't going to feel too young (or too old) to enjoy it.
However, “enjoy" might not be the best choice of words. A latex-clad ninja named “The Rubber Man” isn't necessarily conducive to happy fun times.
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