If you liked
Aozora Shoujo-tai
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...then you might like
Idol Bouei-tai Hummingbird
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Both have cute girls flying airplanes and are both from the early '90s.
If you liked
Tenkuu no Shiro Laputa
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...then you might like
Balthus: Tia no Kagayaki
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Balthus is basically just a pervy cash-in on Laputa borrowing many design elements and themes. It's not even hardcore, as there are no explicit genitalia shots.
If you liked
RideBack
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...then you might like
Dead Heat
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These anime are similar in the concept of competitively racing of stand-up motorcycles on track circuits.
If you liked
Macross Flash Back 2012
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...then you might like
Okubyou na Venus
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These two OVA shame the same setup of being an anthology of music videos about a performer's career, from her rise to stardom. There's very little in the way of a recognizable plot or storyline, and almost no true dialog.
If you liked
Exper Zenon
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...then you might like
Accel World
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Similar concept of having to fight opponents and gain their experience to level in a virtual reality world.
If you liked
Ouritsu Uchuugun: Honneamise no Tsubasa
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...then you might like
Spirit of Wonder: China-san no Yuuutsu
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While not tonally linked, some themes and ideas feel similar enough to merit giving this short OVA a try.
If you liked
De:vadasy
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...then you might like
Aquarion Evol
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While the tone and presentation of Devadasy were trying to cash in on Evangelion's success, the sexual frustrations and hormones of the characters are bluntly stated: the robots run on sexual energy, and it's certainly clear that the Aquaria get powered up by the same mystical force.
If you liked
Sirius no Densetsu
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...then you might like
Gake no Ue no Ponyo
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Both films are similar in themes of unlikely love, characters from different worlds meeting in love in conflict, and similar character design.
If you liked
Manie-Manie: Meikyuu Monogatari
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...then you might like
Redline
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If you liked the idea of racing as dangerous and violent with champions obsessed with winning in Redline, then the second segment of Neo-Tokyo: Running Man, directed by Yoshiaki Kawajiri, shares many of the same convictions. Smooth animation and great detail in destruction of vehicles are present in both.
If you liked
Choujin Gakuen Gowcaizer: The Voltage Fighters
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...then you might like
Angel Blade
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As they're both Masami Obari properties they're naturally rife with his trademark touches. They're even more similar since many of the characters from Gowcaizer are recycled and recolored for Angel Blade.
If you liked
Genmu Senki Leda
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...then you might like
Mujigen Hunter Fandora
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Heroines fight against evil in worlds of fantasy and some advanced technology, and they wear skimpy outfits. They're also both 1985 OVAs.
If you liked
Sengoku Kitan Youtouden Movie
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...then you might like
Jigen Sengokushi: Kuro no Shishi - Jinnai-hen
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Both feature Oda Nobunaga as the evil warlord bent on complete control and uses supernatural help to do so. Of course, only one lone protagonist has the power to stop him. Also both are rife with gratuitous violence.
If you liked
Gunsmith Cats
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...then you might like
Cleopatra D.C.
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Both feature women with firearms and hot cars, often fighting crime syndicates with returning villain characters. Cleopatra DC is has more of a comedic streak while Gunsmith Cats tends to be more serious and gritty.
If you liked
Lupin III: Cagliostro no Shiro
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...then you might like
Layton Kyouju to Eien no Utahime
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A lot of the same themes: crests, ancient mysteries, puzzles, enormous castles, and masked villains.
If you liked
Soukihei MD Geist
|
...then you might like
Violence Jack: Harem Bomber-hen
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Same type of world setting and outlook on humanity, also with a violent beast of a protagonist whose only purpose in life to is horrendously cut people into pieces.
If you liked
Fushigi no Umi no Nadia
|
...then you might like
Taiyou no Ko Esteban
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Both of these anime take place in the past and feature stories about rediscovering ancient technology that is beyond the wildest imagination and power of the modern civilization. Both also have relations to ancient Atlantis.
If you liked
Memories
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...then you might like
Robot Carnival
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Similar anthology movies again with Katsuhiro Otomo (AKIRA, Freedom) as a main director.
If you liked
Manie-Manie: Meikyuu Monogatari
|
...then you might like
Robot Carnival
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Similar late 80s anthology movies with Katsuhiro Otomo (AKIRA, Steamboy) as a main director.
If you liked
Ginga Eiyuu Densetsu
|
...then you might like
Nana Toshi Monogatari: Hokkyokukai Sensen
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Aside from also being an adaptation of a Yoshiki Tanaka, this OVA is remarkably similar yet set within a completely different kind of world. Both contain cunning naval strategists on opposing sides, except in the Seven Cities, it's actually based on the sea. Unfortunately the OVA is only two episodes long, so the story is never able to become realized through anime.
If you liked
Fushigi no Umi no Nadia
|
...then you might like
Shin Kaitei Gunkan
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Similar stories involving advanced civilizations and technology, fought mostly in open water or by using submarines. There's also doomsday devices and plots of betraying one's own kind.
If you liked
Haibane Renmei
|
...then you might like
Angel Beats!
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While Haibane Renmei couldn't be more dissimilar, the concept of the characters being in a supposed afterlife or purgatory are both extremely integral to the setting. Although in Angel Beats!, it seems like they fear the next step and thus rebel in anyway to ensure they don't disappear. However, in Haibane Renmei, they do the exact opposite and are more resigned to their fate, and there is little conflict.
If you liked
Kidou Keisatsu Patlabor
|
...then you might like
Tokio Kidou Police
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Tokio Private Police may be a hentai, but in terms of a cute girl going to work for the police of a big city that uses robots to stop crime, this is obviously a big homage to Patlabor and Dominion Tank Police, but with sex scenes interspersed.
If you liked
Yuugen Kaisha
|
...then you might like
Teizokurei Daydream
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Similar OVAs in that they both revolve around rather attractive women who do detective work relating to the supernatural.
If you liked
Mahou Shoujo-tai Arusu
|
...then you might like
Soul Eater
|
Tweeny Witches (Mahou Shoujo Tai) is a bit more stylistic than Soul Eater, and with quite a more wild story telling pattern. But what's really striking similar between the two shows, besides dealing with the topic of witches, is the art design. Especially evident in the backgrounds and the ways the cities are drawn. Honestly, this recommendation is more because of the art than the stories or characters. If you're a huge fan of straight up action shounen and not more wild storystelling, you might want to pass.
If you liked
Five Star Stories
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...then you might like
Ginga Eiyuu Densetsu: Waga Yuku wa Hoshi no Taikai
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These two films hold similarities in being the beginnings to extremely long and complex stories that span lightyears and hundreds of characters. While LoGH aims for the more realistic depiction of war, FFS has a more flamboyant style and story, but remains just as broad in scope and detail. Both films also are relatively contemporary to each other, also both are more or less an hour long.
If you liked
Giniro no Kami no Agito
|
...then you might like
Green Legend Ran
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I'm surprised no one's made this recommendation yet, honestly. The stories in the two series are somewhat similar, a post-apocalyptic future where with a lot of desert environment. Except in Origin it was a man made disaster, and in Green Legend Ran it had to do with aliens descending onto the planet. There's a lot of similarities, like with nature being aggressive and fighting back, sometimes through the bodies of hosts, people with silver hair being special, and of course that a normal kid finds a girl who's on a journey.
If you liked
Macross: Do You Remember Love?
|
...then you might like
Five Star Stories
|
DYRL and FSS are similar in that they both sort of through you into the situation without a whole lot of backstory, it's probably assumed you should know what's going on already by having seen their previous adaptations. Both are mecha anime, although the focus isn't entirely on the robots but instead on the characters and their situations. Other than that, both feature great animation and coloring, and haven't aged that badly over time. In addition, both are considering space operas and both are the beginnings to their much longer respective stories.
If you liked
Area 88
|
...then you might like
The Cockpit
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Shintani and Leiji Matsumoto both stay true to a somewhat 70's character design, and they both feature a lot of nice airplane action. Area 88 focuses on post-Vietnam era jet fighters while Slipstream focuses on only a few World War II era fighters. But what makes these similar is the attention to detail and level animation both possess. I also think that shows like Macross (and all of its sequels) have yet to achieve the intense thrill of the dogfight like these do.