 If you liked
Alien 9
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 ...then you might like
Kiseijuu: Sei no Kakuritsu
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Both have alien beings that form respective parasitic/symbiotic relationships with humans, the way these humans combat each-other is very reminiscent. The metal screw type protrusions of alien 9 as well as the bladetype things of parasyte and the way they are applied in battles are very similar. Both involve the main character entering this relationship with the alien against their will.
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Recommended by JVskunkape
They are anime focussed around aliens forming symbiotic bonds with human characters. The characters and aliens don't like each other that much at first, but they grow closer over time. The characters fight against other aliens.
Both of these anime series deal with otherworldly creatures that are alien to this world, heavily focusing on the psychological aspect the existence of these sci-fi beings have on human beings. Both have a great amount of heavy symbolism and delve into the character's mentality of themselves alone in the world. Furthermore, both stories have background antagonist-like characters that want to further investigate the abilities and sciences behind the creatures too. The protagonists for both series are also dragged into the world of these enigmatic beings against their will, so prepare yourself for some drama!