Xenophile: a person who likes foreigners or things foreign [from Greek, from xeno- + -phile]. And by foreigners, we mean aliens. And not just humans who live in another country, either.
Aliens can be Intrigued by Humanity or a Fantastic Anthropologist, but what about the inverse — when a human character is obsessed with everything alien? This is often an evolved Na´ve Newcomer character in Speculative Fiction, and serves the same function in being a go-between and (sometimes literal) translator between a strange alien culture and the reader/viewer. Unlike a Na´ve Newcomer, however, the Xenophile doesn't need another character to tell them about the alien culture we meet — they can provide all (or at least, most) of the exposition themselves, cheerfully and enthusiastically! In fact, they're so enthusiastic they probably have neglected their relationships with their fellow humans. In addition to appearing in Science Fiction, this trope can also appear in Fantasy literature where a human character is enthusiastic about non-human races and cultures.
Note: This is not about a character who is attracted to aliens in another way... there's a different trope for that, although the two can easily be combined. Contrast Aliens Are Bastards. Also contrast Absolute Xenophobe. Again, aliens-liking-human-culture examples are a different trope and belong in Intrigued by Humanity or Fantastic Anthropologist. Compare Nightmare Fetishist; if the aliens are weird enough, both can apply to the same character. Compare Admiring the Abomination, where a character (often The Smart Guy) reacts to an alien threat with both excitement and fear.
- Sodam Yat was born and raised in an Absolute Xenophobe society. That didn't stop him from befriending an alien named Tessog who crash-landed on Daxam. Sadly, his parents found out, murdered Tessog, and brainwashed their son to hate aliens again. Sodam only regained his memories when he saw his friend's stuffed corpse in a museum. He became disgusted with Daxam's xenophobia and spent years repairing Tessog's ship so he could leave Daxam forever. The courage and determination it took for him to do this made Sodam worthy of becoming a Green Lantern.
- Ellie Arroway from Contact, both the book and the movie - at least when it comes to the idea of aliens and how to make contact with them.
- Several main characters in Avatar are this to some degree.
- In Enemy Mine, a human and a Drac pilot who are on opposites sides of an space war learn to set aside their racial and political differences to survive on a hostile planet. They start out trying to kill each other, but become good friends.
- Elizabeth Shaw from Prometheus is initially fascinated with the possibility of encountering the alien creators of humanity. That all changes once she discovers the Engineers are monsters that want to wipe out humanity.
- Dr. Newton AKA "Newt" from Pacific Rim is a self-proclaimed Kaiju fanboy. His torso and arms are covered in various tattoos of the monstrous creatures, and he reacts to Hannibal Chau's Kaiju organ black market with a giddy Nerdgasm. Naturally, he's also a leading expert on Kaiju physiology.
- Bren Cameron of C. J. Cherryh's Foreigner series of books. Meant to be an envoy/translator from the human government to the native aliens, he essentially defects to the alien side.
- Willis E. Davidge, from Barry Longyear's The Enemy Papers, turns out this way, getting a thorough education in Drac culture after being stranded on an ice planet with a Drac for quite a while. Note that he and the Drac were fighter pilots trying to kill each other in a war between the two species. In a subsequent story set in the same 'verse, The Last Enemy, we learn he's devoted his life to teaching little dracs the way of Talman, the Drac equivalent of a holy book/history of science/scientific literature rolled into one.
- A few different characters in Larry Niven's Known Space books. Beowulf Schaeffer and Louis Wu come to mind. At least one of them explicitly referred to himself as a xenophile.
- Christopher Holm in The People of the Wind by Poul Anderson spends time hanging out with Ythrians, is adopted into a Ythrian clan, and translates Ythrian poetry.
- Many of Doctor Who's companions seem to end up like this, so caught up with time travel they don't want to go back to their own time.
- Daniel Jackson of Stargate SG-1, seemingly much more at home interacting with the many different cultures and races he's met through the Stargate than he ever is on Earth. He is an anthropologist, after all.
- Several human, alien-wannabes in Earth: Final Conflict and Alien Nation.
- Some among both Minbari and Humans are starting to become interested in each other's cultures in Babylon 5, though many remain resentful.
- In times of Civil War Earth propaganda works to paint Sheridan as an insane Minbari worshipper.
- Star Trek: Deep Space Nine:
- Jadzia Dax gets along with Ferengi, humans, and not least klingons.
- Sisko meanwhile seems to love Bajoran culture to the point that he decides to build a house there. Despite being born on Earth, as the Prophets put it he is, like them, "OF Bajor".
- "Xenophilia" is one of the possible disadvantages in GURPS (applying to anyone exotic, not just nonhumans). It's a disadvantage because it makes you trust potentially nasty creatures more than you should.
- Warhammer 40,000: this is something the Imperial Inquisition's Ordo Xenos works very hard to avert. It doesn't always work, however, due to the monumental size of the task, the subtlety of some of the aliens or the humans involved, and the simple fact that you typically don't want to attract the attention of the Inquisition.
- Many Imperial citizens that live near the Tau Empire are attracted to their "Greater Good" philosophy, and its less brutal treatment of its citizens.
- Some members of the Adeptus Mechanicus are obsessed with the Necrons and their mind-bogglingly advanced technology. And extreme fringe group of the Mechanicus consider the Necrons to be holy warriors. It doesn't help that the Machine God is possibly one of the Necron's own omnicidal deities chained down and sealed away. Other, known as the Xenarites, study any alien technology they can get, under the reasoning that since all technology comes from the Machine God, all technology is sacred, even that of the Xenos.
- There's even a form of radical group in the inquisition known as the Xeno Hybris who believe that humanity has more to gain from cooperating with (certain carefully selected) Xenos than through exterminating them.
- Not just humans: the Eldar philosopher Uthan the Perverse holds that the orks of all species are the superior society, since they aren't best known for ripping open a Negative Space Wedgie and birthing a God of Evil through millenia of sadistic hedonism, or for half their elite military forces siding with Chaos and their greatest leader stuck on life support for all eternity. Then again, the guy's epithet is "the Perverse", so...
The Orks are the pinnacle of creation. For them, the great struggle is won. They have evolved a society which knows no stress or angst. Who are we to judge them? We Eldar who have failed, or the Humans, on the road to ruin in their turn. And why? Because we sought answers to questions that an Ork wouldn't even bother to ask! We see a culture that is strong and despise it as crude.
- The Digganobz of the Gaiden Game Gorkamorka are the descendants of humans who now seek to emulate the orks in every way they can, such as driving big impractical vehicles, shooting while shouting, and other activities which the orks find hilarious (the main reason Mad Max: Fury Road is considered a Spiritual Successor to Gorkamorka is because the War Boys are essentially Digganobz without the green bodypaint).
- Yeoman Kelly Chambers in Mass Effect 2 is thoroughly fascinated by all aliens, which is rather untypical for a member of the pro-human extremist organization Cerberus. However, she says that pro-human does not necessarily mean anti-alien. This stance changes in Mass Effect 3 when she finds out that Cerberus really is anti-alien at its core, realising how she was manipulated by them.
- Paragon Shepard definitely comes across as this; and a Shepard of any alignment has the option of having trysts and/or relationships with alien characters. In Mass Effect 3, the respect and admiration that Shepard has fostered throughout the galaxy is a key factor in bringing them together in the war effort.
- In Galactic Civilizations II, when culture suddenly booms it's credited to/blamed on the Xenophiles (Depending on whether your planets are deep in someone else's territory, or theirs are in yours)
- In Stellaris Xenophile/Xenophobe is one of the ethical axis that Empires can select. Xenophiles have a bonus to diplomatic relations and will tolerate mixed-species populations more readily.
- An aspect of the Knowledge aspiration in The Sims 2. Most Sims will fear being abducted by aliens and having Sims they know get abducted; Knowledge Sims will actually want to meet aliens, and with FreeTime get access to a perk that makes meeting aliens easier.