Here is a list of notable "Visitor" races and factions not of Equus.

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The Visitors

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General

Absent Aliens: Averted. There's no Fermi's Paradox or Great Filter, and they aren't invisible, either. The cosmos is full of Extraequusian life and Equus had been dealing with 'Xenos', 'Aliens' and 'Visitors' since time immemorial, from the many Xenos horrors and enemies which besieged the Golden Imperium in pre-Known History, Solar System neighbours such as the Maretian races who repeatedly invaded Tellus during the Second Age and Venerans races who befriended Tellusian Ponykind during the Second Age, and also the likes of the Silim and Skylander alien-dragoness Prism Wing in the Fourth Age. That being said, the Celestial Ponies do have a 'Alien Non-Interference Clause' which limits their interactions with Tellus/Equus during the Second/Fourth Age and do work to reduce the amount of hostile alien contact with Equus from the outside cosmos.
Aliens Are Bastards: There are many hostile or dangerous 'Visitor' races and factions out there in the cosmos, some of which had attacked Tellus/Equus in the past and present, such as the Maretian races and the Foalrons during the 'Great Wars Era' of the 'Second Age'. That being said, this is by no means universal, as the the likes of Prism Wing and the Celestial Ponies demonstrates. Some don't even deny it.
Noble Worker's companion: We can do this all day!
Extraequusian Villain: This is persecution! Why can't you leave me alone... what did I ever do to you?!
Noble Worker's companion: You tried to kill me and destroy this entire planet.
Extraequusian Villain: ... Apart from that.
Alien Invasion: Some of the more hostile and/or malicious races/civilizations of 'Visitors' had invaded Equus/Tellus in the past and brought great conflict and woe.
Call a Rabbit a "Smeerp": They're basically the Codexverse's extraterrestrial aliens, but given the Ponies and other denizens of Equus in the Fourth Age are not entirely aware of this fact, the more generalized "Visitors" are labelled as such instead. Even in the Second Age, where the Ponies do recognize them as aliens, they are called 'Extratellusians' instead of extraterrestrial on account of the planet being called 'Tellus' at the time.
Fantasy Aliens: The Codexverse is a Science Fantasy setting with significant presence of fantasy and sci-fi elements, making the 'Visitors' - who are extraterrestrials aliens - effectively this trope. Some of the Visitors themselves do have their own magic.
Higher-Tech Species: Some such as the Celestial Ponies are noted as being far beyond Equus in terms of technology. It's acknowledged by several parties that they're likely not a threat to Equus because they'd have already taken over if they'd wanted to.
Innocent Aliens: While some are hostile, others are shown to be benevolent and only harm to protect people or to genuinely vile individuals.
Meaningful Name: They're called 'The Visitors' because they're off-world visitors to Equus, and their actions led to both good and bad consequences for Equus/Tellus as a whole

Celestial Ponies

General

Alien Non-Interference Clause: The Celestial Ponies are implied to have this regarding Equus, remaining in the background and limiting their interactions to the Equusians except where absolutely necessary (such as to protect their hybrid 'Sparkle Pony' populations), as well as do what they can to reduce regularity of hostile alien species attacking and invading from beyond the Solar System. It's implied from the Second Age entries and drabbles they only judge the time for a First Contact to be right when the Equusian races invent some form of Faster-Than-Light Travel - no sooner had Professor Bright Eyes, the Scholar of Justice help developed and test one, she immediately received a message from the Celestial Ponies asking if they want to be friends.
Curb-Stomp Battle: They're implied to be a race of aliens that's not native to Equus. And yet they are so powerful that they can easily lay waste to even entire civilizations if they want to. Yet they are very benevolent and only fight if provoked with good reason, as people who tried to experiment on the Sparkle Ponies found out.
Human Aliens: Celestial Ponies look very similar to Equusian ponies, except for antennae and glowing. This is noted as odd In-Universe and implies convergent evolution is at work or the same deity had an influence in both of their origins.
Innocent Aliens: The Celestial Ponies are shown to be benevolent, only harming to protect people or to genuinely vile individuals. However, it's implied that there are exceptions to the rule.
Papa Wolf: Sparkle Ponies being abducted and experimented on tends to make them very angry. This is likely because it's implied Sparkle Ponies are their hybrid offspring. In one incident, a male Visitor devastated a Clovenist compound for abducting and attempting to experiment on his daughter, a young Sparkle Pony foal.
Sufficiently Advanced Aliens: Enough that a well-armed Visitor can casually break into a Hive or military base, fight through entire cohorts of soldiers, war machines and even a demigod, just to retrieve their imprisoned children. It had been noted that if they wanted to, they could had invaded Equus and wipe the floor with every faction with their indisputably advance magic/technology, but chose not to out of implied benevolence.

Queen Andromeda

Classification: TBA

Portfolio: TBA

Rank: Antecedent

Queen Andromeda (first introduced here

) is the enigmatic yet powerful and benevolent Queen of the Celestial Ponies. She and her husband, the Celestial King, observed the Maretian Wars that gripped Equus in the Second Age.

Animalistic Abomination: Her true divine form as a Celestial Pony goddess is described as a much larger mare with six wings, and a mane and tail made of solar storms. It's noted that in this form, she looks rather similar to Golden Scepter, whose true divine form is also a six-winged Alicorn, except his hair is made of black spatial energy and his wings are made of holy fire.
Get Out!: After making it clear to a Maretian diplomat that his people have started conflicts that they lost, and that the Maretians will eventually die to the violence they used so often, Queen Andromeda would shout at the diplomat to "GET OUT!" with her magically-empowered voice. The Maretian diplomat had no trouble obeying.
God-Emperor: Gender-inverted. Despite her official ruling title being "Queen", she is described as the intergalactic equal to Golden Scepter by one of the Codexverse writers, being a divine Celestial Pony Alicorn goddess who rules over her mortal subjects and possesses great power and technology that surpasses those of most "Visitors". Come the Fourth Age, by the time of the Obez'yanans invasion, her rank is upgraded fully to Empress, while her daughter Asteria became Queen in her place
Gravity Master: She could create gravity wells, which she used to crush an offending Maretian ambassador's offensive weapon after he tried (and failed miserably) to kill her with it.
The High Queen: Implied. Going from her interactions with the Maretian ambassador and her husband, the Celestial King, she's a compassionate and benevolent ruler who won't take kindly to threats even to innocent people not of her own race. She was also delighted when the "Children of Equus/Tellus" chose to be merciful to the defeated Maretians after the "Maretian Wars" ended instead of exterminating them in retaliation for their attempted conquests/subjugation of their planet.
Immortal Ruler: She's the Celestial Pony equivalent of the Alicorns of Equus, and rules over the mortal Celestial Ponies. One of the Codexverse writers, Kendall2, described her as being the intergalactic equal to Golden Scepter, as she is an extremely ancient goddess who embodies Celestial Ponykind (among other things) just as he is an extremely ancient Alicorn god who embodies mortal Ponykind (among other things).
Large and in Charge: Her true form as a Celestial Pony Alicorn goddess is larger than her "default" form, and it's noted that her true form is also similar to Golden Scepter's in height. She's also the Queen of the Celestial Ponies.
Magic Hair: Her true form has a mane and tail that are both made of solar storms.
No-Sell: When a Maretian ambassador tried to kill her with a Death Ray for flatly refusing to make an alliance with them until they stop attacking Equus, she simply got up, walk through the barrage and wrenched the weapon from the Maretian's grasp with the ease of an angry adult taking away an unruly child's toy, all without a scratch. This is justified in that her regalia/armour and her people's technology in general are so much more advance than the Maretians that a lethal Death Ray that could had reduced a unprotected Pony to skeleton and ashes is essentially just a harmless toy to them. What made this notable is that it wouldn't had worked even if she went unarmoured: she's a ruling divine sovereign, which in the mechanics of the Codexverse can barely if at all be affected by any matter or magic (while the opposite is true vice versa) unless said matter or magic is charged with Primordial Quintessence.
Physical God: She's the Celestial Pony equivalent of an Alicorn, and she is an extremely ancient and powerful goddess who embodies Celestial Ponykind. It's implied that she is as old as Golden Scepter, as her true divine form is an Animalistic Abomination with six wings just like him, and a mane and tail made of solar storms.
Time Abyss: Implied. The fact that her true Alicorn form is a six-winged Animalistic Abomination similar to Emperor Golden Scepter's speaks of how ancient she is.
Tranquil Fury: She's not happy with the various factions of Maretians repeatedly attacking Tellus/Equus with desires to conquer the planet and subjugate/exterminate Ponykind. She calmly but firmly gave the Maretian ambassador who tried to negotiate an alliance with the Celestials (then try and kill her when she refused) a brutal dressing down of their violent, hostile and aggressive culture and scared the Maretian senseless with her true form, only raising her voice when she punctuated her disapproval with a divinely-enhanced roar for him/her/it to Get Out! of her ship.
Vertebrate with Extra Limbs: Her true divine form has six wings to show how ancient and long-lived she is.
Winged Unicorn: A Codexverse drabble describes her appearance as resembling the Alicorns of Equus, yet at the same time she isn't one; rather, she's the Celestial Pony equivalent of an Alicorn. She also has six wings to show how ancient and powerful she is.

The Celestial King

Classification: TBA

Portfolio: TBA

Rank: Antecedent

The Celestial King (first introduced here

) is the consort of Queen Andromeda. He accompanied her in formal processes such as diplomacy and seem to act as both a supporter and adviser to her. Also first appeared in a canonized Codexverse drabble that took place in the Second Age, during the Maretian Wars that gripped Equus.

The Good King: He's implied to be a divine sovereign much like his wife Andromeda, and behaved in a wise and just manner in his first appearance.
Guilt-Free Extermination War: Discussed. The Celestial King wondered if the 'Children of Equus', should they managed to finally take the war back to Mares, would try and exterminate the Maretians in revenge for nearly a century and a half of attempted conquest and genocide. To Queen Andromeda's delight, they didn't.

The Reptilians

General

Expy: They're heavily based off the Yautja, though they're much more benevolent in temperament, only targeting vile people for their hunts.
Hunting the Most Dangerous Game: They seem to enjoy hunting sapient prey, but limit themselves to genuinely vile people.

Giants of Light

General

Light Is Good: Their species name is 'Giants of Light', and the vast majority of them are benevolent and heroic. There are exceptions, but they're noted to be extremely rare due to how small the species' numbers are.

Lord Svetlo

First featuring in a drabble set during 'Final Ragnarok', Lord Svetlo was the Giant of Light who crash-landed in Cervidia long ago and fell in love with Astrid, making him the father of Lysets Far, the Light Father and grandfather of Tarou. In the time between his departure and the present day he had managed to ascend to godhood and continues to both watch over his beloved and scions from afar, as well as protect the cosmos at large from various monsters and threats.

Alien Among Us: Spent some time in Jotunnheim back when he was a mortal heroic Giant of Light, after crash-landing there. During that time he courted Astrid and produced Lysets Far from their union, who would inherit his heroic mantle on Equus after Svetlo left.
Big Good: Literally and metaphorically, being a Giant of Light god who had fought monsters and evil beings across the cosmos, protecting many worlds from destruction and depredation even while history continued on Equus.
Blood Knight: Honourable benevolent version. His idea to prove his worth to Astrid's Jotunn warrior god father was to find and defeat one of the meanest monsters in Jotunnheim at the time. Astrid's father Hrothgar approves.
Badass Cape: Wears one as part of his attire after ascending to godhood.
Large and in Charge: Since his ascension to godhood, he had grown in stature to the point that one of his subordinates, a skyscraper-sized Giant of Light himself, had to be on the upper levels of their enormous vessel's bridge just to be on eye-level with him. Lord Svetlo is also in charge of a sizable force of heroic Giants of Light across the cosmos, keeping the peace across many worlds and battling evil wherever they appear.
Mile-Long Ship: The mothership he rides in is positively enormous - dwarfing every vessel on Equus thus far - but also advanced enough that even in orbit no one barring the most observant star-gazer could even see it there.
Wowing Cthulhu: How he got the right to court Astrid: proving to her father Hrothgar, the Endless Winter he was worthy of the Jotunn war goddess' hooves and his respect by finding the most ferocious giant monster available and beating the crap out of it. Hrothgar was impressed and approves of his conduct even before Svetlo actually sets out to do it.
Hrothgar: Good answer.

Maretians

Visitors/Aliens hailing from the planet Mares (Codexverse's equivalent of Mars), throughout the 'Second Age' of Known History they had repeatedly attacked Tellus/Equus with intent to conquer the planet and subjugate/exterminate Ponykind. They would serve as one of Tellus/Equus' greatest 'outside threats' for nearly one and a half century in what history would record as the 'Maretian-Tellusian Wars', with the 'Children of Equus' gradually catching up and turning the tables on them, chasing them all the way back to Mares and defeating them once and for all.

General

Aliens Are Bastards: Subverted. There are some Maretians who really aren't out for conquering Tellus and enslaving/destroying Ponykind/Equuskind back in the day. The Expies of the Butt Ugly Martians, for example, defected to Tellus, and their help was instrumental in Ponykind turning the tables on Mares after nearly centuries and a half of on-and-off conflict. This and other factors was also what led to the Tellusians/Equusians deciding to spare Mares when they could had easily wiped them out at the end of the Maretian Wars.
- The Ackackian Maretians, because of the widespread brutality and destruction across Tellus/Equus over the course of their invasion, were presumably seen as this by many Tellusian Ponies.
  Hooviet Propaganda:
  "Do not count the days. Do not count the miles.
  Count only the number of Maretians you killed.
  Kill the Maretian - that is your mother's prayer.
  Kill the Maretian - that is your children's wish.
  Kill the Maretian - that is your nation's cry.
  Do not waver. Do not relent.
  KILL!"
Can't Catch Up: The Maretians initially had a major edge on the Tellusians and wars were brutal, with Tellus barely surviving. However, a combination of (greater) Maretians disunity and infighting than the Tellusians, their planet's crumbling biosphere, and Tellus reverse-engineering tech from all their different races (or just being given it by defectors) lead to Tellus catching up and eventually outclassing them. It's such that later many a confrontation between the two worlds, at least with regards to minor incursions, were implied to be a Curbstomp Battle in Tellus's favor and Mares is decisively defeated when Tellus invades them back.
Death Ray: Standard as to many Maretian factions. Apparently comes with both Heat Ray and Disintegrator Ray variants. One used by a Maretian ambassador had enough power to reduce a Pony soldier to ashes and bones - which makes Celestial Queen Andromeda's complete No-Sell of its effects with her armor all the more impressive.
Do Not Taunt Cthulhu: As it turns out, both their nearly destroying their own planet and monstrous warmongering made a lot of their gods very angry. This bit them hard when the Tellusian invasion's metamagnetic/magical weapons and powers woke up a lot of their gods, many of whom promptly sided with the Tellusians.
Flying Saucer: One of their most notable means of transportation and weapons of war/conquest. It was mentioned in passing that many of these from the Ackackian Maretians were captured after the Maretian War of 1961-62.
Forever War: The Maretians races/factions and Tellusian Ponykind fought on-and-off for around 120 years, with the Maretians repeatedly attempting to conquer Tellus/Equus and subjugate/exterminate the Tellusian Ponies while the Tellusians struggled tooth and tail for generations to survive, catch up and beat them back. Needless to say, the enmity between the two worlds run deep.
Gaia's Vengeance:
- There's some indication Mares' status as a dying world is their own fault, with some of their gods specifically turning on them in favor of the invading Tellusians due to what they'd done to their world.
- A canonized drabble reveals they ended up on the receiving end after Tellus's native kaiju, the Titans, were awakened. As the Titans are aggressive towards anything overtly threatening the biosphere, the Martians strip mining and terraforming intentions tend to result in an angry Titan rampaging through their forces.
Glass Cannon: The Maretians generally have some pretty powerful offensive weaponry...but with one known exception, they're all physically weaker and frailer than most Tellusian species. Thus, if their offensive abilities are negated or otherwise circumvented, a Tellusian can generally overpower them effortlessly in melee.
Heel–Race Turn: At least some of their races and factions made peace with Tellus during or after the Final Tellus/Maretian War, be it via their planet being saved by the Tellusians, respect for the planet that kicked their flanks, or just self preservation. Notably, the first actual contact with Mares in the Fourth Age is overhearing transmissions from a group of Ackackians who idolize Sweetheart and emulate her due to having spared members of their kind during that war.
Just Before the End: Implied. The first Maretian Invasion is implied to be a Whole-Plot Reference to The War of the Worlds, where the Martians invaded partly in desperation as their world was slowly dying. If the same applies for Codexverse Mares, the implications are that the Maretians were motivated by their own survival as it was by their desires to conquer other worlds and destroy their 'inferior' inhabitants.
Low Culture, High Tech: Not in the 'Medieval society with spaceships' sense, but in the 'Barbaric culture with death rays' sense, at least in the opinion of Queen Andromeda of the Celestial Ponies. Despite being more advanced technologically than Equus/Tellus for much of the Maretian Wars and pretentiously believing they are better than the Ponies (and others, including rival Maretian races) they generally act like a bunch of murderous savages filled with desires for domination, destruction and death.
Planet of Hats: Subverted. It is noted that there are many different Maretian factions and races inhabiting Mares, not unlike Tellus/Equus itself for most part (Though most of them weren't active on Tellus/Equus at the time). They apparently spent just as much time fighting amongst themselves as they tried to attack Tellus/Equus, which might also explain why Tellus/Equus ultimately won the struggle against them.
Puny Earthlings: As a whole, they see Tellusian Ponykind as little more than animals and savages to be subdued/destroyed and make way for Maretian colonization/conquest of Equus/Tellus. After centuries of endless near-subjugation and torment at the hands of the Maretians, however, the Ponies Equus/Tellus would eventually turn the tide by learning how to adapt, reverse-engineer whatever Maretian supplies/technologies they managed to acquire and invent whatever they cannot, while allying themselves with friendly Maretians who didn't agree with what their people were doing, including the heroic Butt-Ugly Maretians trio. The end result during the final stretches of the "Maretian-Tellusian Wars" is a brutal turnaround where the Maretians would suffer the same heavy losses that their victims did, unable to adapt and advance in similar ways because of their collective arrogance and warlike, squabbling and bullying mindset.
Smug Snake: Many Maretians seem to think highly of themselves and see all others - including Ponykind and other rival Maretian races and nations - as being beneath them and easy prey for the slaughter. In the canonized drabbles, Queen Andromeda of the Celestial Ponies would pop the ego of one Maretian ambassador quite thoroughly, while at least one Maretian leader by the end of the Maretian Wars - when the forces of Tellus/Equus were quite literally on Mares' doorstep, suffered a quiet Villainous Breakdown as he/she/it came to realize that compared to the more civilized Ponies who caught up with them, THEY were the inferior ones.
Technologically Advanced Foe: Played Straight as this for Equus, at least during the first half of the Maretian Wars. The First Maretian-Tellusian War was heavily implied to be a Whole-Plot Reference to the H.G. Wells' The War of the Worlds, which was a Curbstomp Battle for most part in the invading Maretian faction's favour before the germs wiped them out. The Third Maretian-Tellusian War, while ending in Tellus' favour, was a hard-fought victory which left much of Equus/Tellus in ruins and millions dead owing to the tech-edge and extreme brutality of the invading Ackackian Maretian race. By the final war, however, the Tellusians/Equusians caught up and even surpassed them technologically and militarily, taking the war to Mares' doorstep and forcing their surrender.
- Subverted hard with the Celestial Ponies, who at that time were so much more advanced than the Maretians that even a Celestial Pony soldier's basic armour could No-Sell a Maretian Death Ray that would have reduce a Tellusian/Equus Pony soldier to ashes and bones. If everything else scales-up to that, the Maretians literally don't stand any chance against them.
Villain Forgot to Level Grind: What ultimately help did them in: with each failed invasion, Tellus/Equus grew stronger, both from experience and from reverse engineering their tech along with some defectors sharing it with them. This is bad news for Mares, as they were highly reliant on their tech edge. In the final war between the two planets, the Tellusians chased them back to Mares and invaded them, decisively defeating them.
We ARE Struggling Together: Yet another contributing factor to their final defeat: They were often divided and squabbling among themselves, even more so than the Tellusian Ponies were for all their faults. The various Maretian factions, nations and races apparently spent just as much time warring and bickering against each other as they do the Tellusian Ponies and often end up sabotaging each other when they REALLY should be working together, like working to conquer Tellus/Equus or hold back the decline of their dying planet. The one time they finally and collectively put aside their differences - apparently in the Final Maretian-Tellusian War - was when they realized that their world is now truly screwed beyond repair and that the Tellusian Ponies had caught up with them, meaning they only had one last chance to conquer and colonize Tellus before they're doomed. But by then, it was already too late.

'Wellsian' Collective Hives

Captain Ersatz: Of the tentacled, bulbous-headed Martians from The War of the Worlds, with some inspirations taken from expanded media around it.
Curbstomp Battle: Dished out one and on the receiving end of another.
- While it's implied the Ponies did much better than in the original story, their invasion of the Isle of Pony was still a massive Curbstomp Battle that humbled the Bitish Empire and would had facilitated the conquest of the rest of Tellus were not for the Maretians succumbing to infectious diseases.
- They tried again in 1938 at Ponyland. This time, however, it was they who were on the receiving end, since apparently they had made little advancement of their technology in the intervening time, while Pony technology had advanced swiftly and also now had powerful beings in the form of super-heroes like Metamare and Silversmith to lead the defense. Entries noted that Ponyland ended up crushing the incursion with almost 'contemptible ease'.
Death Ray: Had one in the form of their Tripods' heat-rays, which did quite a number on the Tellusian Ponies during their 1896 invasion at the Isle of Pony. These were later reverse-engineered and used by the Ponies after their invasion/incursion failed, most notably by Dr Silversmith and his Arch-Enemy Overmare.
Deadly Gas: Also used to devastating effect on Ponykind with their 'Black Smoke', and also reverse-engineered by Ponies after the conflicts. Silversmith somehow managed to derived dozens of safe, useful commercial products from them, and also created a variant that could corrode metal instead of just choking the life out of their victims.
Shocking Defeat Legacy: Inflicted this upon the Bitish Empire and by extension the rest of Tellusian Ponykind with their devastating invasion of the Isle of Pony in 1896, which was a Whole-Plot Reference to The War of the Worlds.
Technologically Advanced Foe: Was this during the 1896 invasion of the Isle of Pony with their Tripods, Heat-rays, Black Smoke and other things that were beyond what the Ponies knew or able to effectively counter, resulting in a Curbstomp Battle. This however was subverted and turned around in their 1938 incursion, which was far less successful since apparently they did not advanced their own tech-base much in the intervening decades.
Tripod Terror: Being ersatzs of the 'War of the Worlds' Martians, the 'Wellsian' Maretians uses tripods as their primary war machines. One of them was preserved well into Equestria's time in the 'Fourth Age', kept inside one of Queen Dazzleglow's vaults.
Villain Forgot to Level Grind: When they first invaded Equus/Tellus, they were so advanced at the time that Ponykind frequently suffered brutal, devastating defeats. 42 years later, in 1938, the Martians invaded Equus/Tellus again on the assumption that the ensuing battles will again end overwhelmingly in their favor. They were quickly proven wrong - Ponykind was able to advance technologically thanks to the efforts of geniuses like Dr. Silversmith, Sr., allowing the Martians' invasion to be crushed with "contemptible ease".

Mare-Toxon Triumvirate

Achilles' Heel: Their war machines' barriers have to deactivate and reactivate within the nanosecond it takes for their death rays to fire through them. As their actual armor isn't all that durable, in this nanosecond, they're vulnerable to attack and can be destroyed.
Expy: Of the bipedal, three-eyed Martians and three-fingered Martians from The War of the Worlds (1953), with their official name and additional details drawn from the spin-off tv series War of the Worlds (1988).
Logical Weakness: Their death rays can fire despite their nigh-unbreakable barriers. Silversmith deduces that for this to be possible, the barrier must deactivate and reactivate within the nanosecond the death ray would pass through it. As a result, they are vulnerable to attack in that moment.

Enigmarean Remnants

One of the many Maretian races, the Enigmareans were reduced to refugees in space when a war against other Maretian civilizations devastated their own and crippled their people with mutation. Faced with a slow extinction and lacking resources, they nevertheless embarked on a great gamble to settle/conquer Tellus in order to rebuild their civilization and replenish their genepool, starting the Enigmareian Incursion

of 1957.

Battle of Wits: The Enigmarean Incursion was one between them and Tellus, as the Enigmareans do not have the numbers and resources to totally conquer Tellus, while Tellus does not (yet) have the technology to defeat their forces, forcing both sides to try to out-wit and out-innovate each other instead of the usual slugfest which defined the other all-out Maretian invasions.
Big Bad: Of the 'Enigmarean Incursion' account, which chronicles their attempted Alien Invasion of Tellus in the Second Age.
Expy: Of the Human-like 'Mysterians' from the 1957 Toho sci-fi film The Mysterians.
Human Aliens: Is classified as a Near-Pony Maretian race. Enigmareans and Ponies are so similar in fact they could interbreed, and it becomes important in the Enigmareian Incursion event as they want to breed with Ponykind as part of their demands.
Non-Indicative Name: The Enigmareans called themselves such after the planetoid they colonised after being driven from Mares, which was named as such by a Tellusian Pony astrophysicist (who later became a collaborator). This was especially so since they wanted to avoid revealing their Maretian origins, since this would antagonise the Tellusian Ponies who already had faced several Maretian invasions and have every right to be suspicious of them.
The Remnant: The Enigmareans faced by Tellus were a shattered, declining remnant of their former glory, having been devastated and driven from Mares in a war against other Maretian races which left their race crippled by contamination from atomic, biological and chemical weaponry. This forced them to try and settle/conquer Tellus in a desperate attempt to rebuild their civilization and restore their population.
We ARE Struggling Together: The Enigmarean remnants are divided into three major factions regarding how to approach Tellus: The 'Peace' faction, revolving aroung their scientist castes, want to peacefully settle on Tellus and integrate with Ponykind. The 'Militant' faction from their military castes want to totally conquer Tellus while they still hold a tech advantage. Most of the leadership caste is composed of 'Centrists' who pursued a plan which balances the points and demands of both factions. This division contributed to the Enigmareans' eventual defeat.

Ackackian Stratotechnocracies

Armies Are Evil: Their civilization dominated at least in part by their military (hence the 'stratocracy' in their name), and they are feared and hated by both Tellus and even rival Maretian races/civilizations for being bloodthirsty warmongers, with their invasion of Tellus between 1961-1962 being notorious for being exceedingly brutal.
Butt-Monkey: Their initial invasion was exceedingly brutal, but future attacks when they no longer have their tech edge do not go their way and often end up being humiliatingly dealt with. Justified, as their tech edge was literally their only advantage against Tellusians, as they're physically frail, weak, and physically unimpressive otherwise.
Expy: Of the humanoid, skeletal-looking Martians from the 1961 Topps Trading Card version of Mars Attacks!.
The Dreaded:
- Next to the Wellsian Maretian Hives, Tellus fears and hates them the most for their brutality and viciousness during their attempted-conquest of Tellus back in 1961-2. Even in the 'Fourth Age', the mere thought that they're back was enough to make several recently ascended-and-returned members of the Virtuous Seven anxious. Although luckily Sweetheart's efforts back then managed to successfully reform at least a sizeable part of the civilization into more peaceful and friendly culture.
- Deconstructed, as once Tellus gets heroes or technology capable of negating their tech edge, this fear and hate results in heroic forces having no real qualms about dealing with them.
Glass Cannon: They have death rays and other horrible weapons...but they're physically extremely frail, weak, and all around lacking in melee combat, something shown in their source material and the movie. This poses a major problem for them when Tellus catches up and surpasses their tech edge, as it was the only thing that they really had.
Heel–Face Turn: A drabble set in the Fourth Age revealed thanks to Sweetheart of the Virtuous Seven, at least a sizeable fraction of the Ackackian Maretian civilization which had survived and rebuilt following the 'Void Aeon' had reformed into a more peaceful and friendly culture who took Sweetheart's kindness to heart/circulatory-organs. This is helped by the fact one of the Ackackian Maretian deities, a noble war god, was horrified and outraged when he woke up to find how monstrous the Ackackians had become, and joined the fight to beat up his adversary, a malicious war god partly responsible for their corruption, in the climatic stages of the 'Final Maretian-Tellusian War' which opened the way for their reformation. A decade-long 'De-Ackackianization' social-engineering program ran by Tellusian Ponykind post-war, similar to the 'De-Nazification' of Germany, was also also mentioned and which probably further helped towards that end.
Humongous Mecha: Ackackian Maretians use enormous piloted war-robots as part of their war-machines, but their definition of what is truly a 'Giant Robot' differs from those of Tellusian Ponykind. There was some initial confusion when the Ackackians were shocked when battling the Power Rangers for the first time to find that the Tellusians have giant robots - something which the Tellusians actually possess as early as the 1940s. However, this is because it turns out they don't classify anything smaller than a skyscraper as a giant robot, whereas for Tellusian Ponykind anything bigger than a bulldozer qualifies as such.
Meaningful Name: 'Ackackians' are named as such because that's pretty much the only thing they say whenever they speak through their creepy lipless jaw-bone mouths. Their civilization designation of 'Stratotechnocracies' reflects both the prominence of their scientists and engineers (hence 'Technocracy') and those of their brutal military-industrial complex (hence 'Strato-' of a 'Stratocracy') in their society and government.
Oh, Crap!: A group of them ended up fighting the Power Rangers. It's implied their reaction was a series of consecutively larger Oh Craps as the Power Rangers equipment withstood and outclassed theirs.

Tyr'ahnic Tyranny

Alliterative Name: Tyr'ahnic Tyranny.
Expy: The aliens of the Tyr'ahnic Tyranny are inspired design-wise by Marvin the Martian, while their entire society is inspired by Duck Dodgers' interpretation of Marvin the Martian as hailing from a galactic empire.

Boggatian Interplanetary Empire

Big Bad: Emperor Bog served as this for both the Butt-Ugly Maretian trio and also one of the most prominent among the hostile Maretian races to Tellus/Equus, being a despotic conquering ruler like the leaders and members of Maretians who want to dominate the Solar System, including other Maretian races and factions.
Expy: Of the Butt-Ugly Martians from their short-lived titular show, Butt-Ugly Martians. In their case, they're lifted from the cartoons because Hasbro owned the toy rights for the series.
Defector from Decadence: Not everybody supported Emperor Bog and the Empire's autocratic rule and military expansionism, as the Butt-Ugly Maretian trio that defected to Tellus and befriended the Virtuous Seven demonstrated.
Suicidal Overconfidence: Zig-Zagged: their initial invasion of Equus consisted of three people, but it's possible rather than expecting them to actually conquer the planet on their own, it may have been a suicide mission to test Equus's defenses ahead of their invasion.
Super-Strength: Notably, by the standards of Maretian races, they're abnormal for being more physically robust and strong than Tellusian ponies, when normally it's the opposite due to Mares' lower gravity.
The Empire: The most obvious example thus far among the Maretians of the 'Second Age', with it being ruled by an 'Emperor Bog.'

Venerans

General

Aliens Are Bastards: Subverted. While there are some races, nations or factions like the Trilian Imperium (led by the Melton) which are hostile, many of the races were reasonable or even friendly. Telluskind's discovery of this fact in the epic '1967-9 Expedition To Venera' profoundly changed Ponies' outlook on the rest of the cosmos: whereas before the Maretians gave them a very negative impression of Extratellusian life and civilizations, at Venera they found conclusive evidence that not all aliens are hostile and some are even benevolent. The races and nations of Tellus and Venera would subsequently become longstanding allies.
Captain Ersatz: Their planet is one for Venus, being its name in Russian and other Eastern European languages. By extension, the Veneran races and civilizations are Captain Ersatz for Venusians.
Venus Is Wet: Since it's habitable world in the Codexverse and plays with all the discredited tropes involving Venus in the past, by implication it was likely this.

The Melton/Trilian Imperium

The Mobuli/'Space Manta Rays'

General

Aliens Speaking English: Subverted: they speak their own language that Star Flower had to learn to be able to communicate properly. This is why the 'Emperor' and 'Nebula' are Only Known by Their Nickname.
The Empire: The Mobuli under the 'Dominion of Imperial Majesty', officially classified as a 'Militant Genocidal Expansionist Totalitarian Monarchy'. Comparisons had been made with Reichist Germaney.
Fun with Acronyms: The fascist D.I.M regime stands for "Dominion of Imperial Majesty". Star Flower originally gave it that name for convenience after translating it in her Equusian language... only to realize later how appropriate it was.
Star Flower (fighting Mobuli Imperials) Take that you dust-sprinkled D.I.M.-WITS!
Hegemonic Empire: What the Mobuli is transformed into after Star Flower helped Nebula and the Mobuli Resistance overthrew the Dominion and its 'Emperor', officially classified as a 'Scholastic Pacifistic Egalitarian Enlightened Monarchy'
Only Known by Their Nickname: Mobuli isn't their actual species name, rather it's the one Equus came up for them. Their actual species name doesn't translate into Equusian properly. The same also applies to the 'Emperor' and 'Nebula', which are just what Star Flower called them.
Scary Dogmatic Aliens: Downplayed during the Dominion era. While the Dominion faction is very similar to Nazi Germany in both leadership and philosophy, the Mobuli in general were once a very brutal race of warriors and conquerors who turned to a more peaceful and scholarly lifestyle after having their warmongering ways go very badly for them at one point. After the 'Emperor' took over and tried returning the Mobuli to its martial past, many disagreed with his methods and formed a resistance, which stranded Flutter Pony astronaut Star Flower became a part of during her adventures. Eventually, the Dominion crumbled and dissolved upon the 'Emperor''s death, and the Mobuli were repurposed into benevolent warrior-protectors of the galaxy by the new Emperor, 'Nebula'.

'Nebula'

A young, immature Alpha Mobuli whom Star Flower befriended during her time as a resistance fighter against the Mobuli Dominion.

Redeeming Replacement: The last Emperor was essentially a Mobuli supremacist who launched genocidal campaigns to wipe out non-Mobuli species to ensure his own people's superiority, leaving many of said species either extinct of critically-endangered. 'Nebula', his successor, proved to be far more benevolent, as he turned his people into benevolent protectors of the galaxy without discarding their martial origins or their current scholarly lifestyle completely.

The 'Emperor'

Arch-Enemy: He was effectively Star Flower's mortal nemesis during her time in the Mobuli's Empire.
Authority Equals Asskicking: The leader of the Dominion of Imperial Majesty, and also a rare Alpha Mobuli who's naturally far larger and more powerful than his subjects.
Big Bad: He was effectively the main antagonist of Star Flower's story while she was trapped in the Mobuli's star system, and she needed to defeat him to be safe to leave.
Cold-Blooded Torture: Inflicted this on Star Flower personally during a time of captivity using his poison, and noted to be particularly painful thanks to the 'Emperor' being a unique Alpha sub-species of the Mobuli.
Final Solution: He's responsible for multiple counts of genocide, leaving multiple non-Mobuli species extinct or critically-endangered.
Master Race: Believes he and his fellow Mobuli of his Dominion are this, and intends to return their race to its roots as conquerors in order to facilitate their supremacy and dominance over the system and the cosmos. Directly responsible for multiple accounts of minority persecution and outright genocide.

The Kirko

General

First mentioned in a drabble

, the Kirko are an extra-equusian insectoid-reptilian race with a rather complicated history with the races and world of Equus. Now, some of them are heading to Equus after countless millennia of separation, seeking an understanding over their role in their "rebirth".

Adaptational Backstory Change: Two, one for their time as the Tyranids and another for their present form as the Kirko.
- In their base game, their origins are left largely ambiguous beyond that they are of extragalactic origins, with multiple contradictory evidence hinting as to their origins, and their motives are barely comprehensible due to just how alien they are with the only smallest hints suggesting they were running from something even worse. In the Codexverse, it was revealed in a drabble they were the Genesis Sovereign's failed attempt to create a replacement to fill in the role her sibling the Void Sovereign was meant to carry out before he went omnicidally stark-raving bonkers, clearing out old or corrupted worlds to make way for new creations. Somewhere and at some point, something had Gone Horribly Wrong and they became the ravenous galaxy-devouring horrors they would become.
- In Age of Wonders: Planetfall, the Kirko are a psionic insectoid race encountered by the Star Union which was seen as a threat and were conquered, cybernetically-enhanced/controlled and enslaved to do the Star Union's bidding until the Star Union collapsed, setting them all free. Here, it is Tellus/Equus and Mares which managed to do so during the Imperium Era, having somehow broken some of the Tyrannic Swarms free from their hive-mind (if not outright neutralized it, cybernetically upgrading them and enslaved them to their will, only to become free with individuality once the Imperium of Ponykind and the Mechanicum of Mares collapsed.
The Dreaded: During their time as the Tyranids, they were this to virtually everyone in the galaxy once they started invading, between their unparalleled numbers, their insatiable voraciousness, their incredible adaptability and their surprising intelligence. Even some of the most hardened or heartless beings and factions in the grim darkness of the distant past completely broke down in sheer terror and despair at their coming upon realizing just how unstoppable they are.
Mechanicum Archmagos: We cannot live through this. Ponykind... CANNOT LIVE THROUGH THIS. In a single day, they have covered the surface of this planet with a flood of of living blades and needle-fanged mouths! Kill one, and ten take its place! If they are truly without number... Then our race is DOOMED to a violent death before every shred of our civilization is scoured away by a force more voracious than the fires of HELL themselves!

DEATH! By the Machine God! DEATH IS HERE!
- The above is lifted nearly word-for-word from an actual quote describing the Tyranids. Take Our Word for It: They really are THAT bad.
Expy: Of the Kir'ko from Age of Wonders: Planetfall, although they started out as the Tyranids.
Horde of Alien Locusts: They used to be this, but are no longer so after the Golden Imperium and Mechanicum of Mares somehow managed to break them off from the Hive Mind (if not outright neutralized it) and enslaved them, and then when they fell left the Kirko to their own devices with their individuality intact.
Walking Spoiler: The Kirko used to be the Tyranids.
Zerg Rush: As the Tyranids, they were feared to be without number: kill one, and ten would take their place, replenishing them using organic matter from the worlds and enemies they killed and consume to create new swarm bioforms. They were so numerous in fact it was said during their invasions their bioships and bioforms outnumbers the stars themselves.

Deliverance Brood

King Vae'Victis

First introduced in a Drabble

, King Vae'Victis is a Kirko leader who is leading his swarm towards Equus in search of answers about themselves and how they came to be

Obez'yanans

General

Adaptational Heroism: The fact they're a Dying Race from a doomed planet seeking a new home is glossed over in their other appearances. Here, it's played up as a focal point, with their driving force being desperation to survive. Unlike their inspiration, they end up on peaceful relations with Equus and most of their species were civilians.
Composite Character: They're a combination of the Showa Era Simians and the Anime Trilogy's Bilusaludo from the Godzilla franchise.
Dying Race: Their homeworld fell into a Black Hole, their ships can't reach any further than Equus in terms of habitable worlds for their species, and if they don't find a new homeworld, they'll likely die.
Heel–Race Turn: The majority of them are innocent civilians who, after their invasion and their military are destroyed, simply immigrate as refugees and intagrate into society.
Invading Refugees: The Obez'yanan lost their homeworld to their sun dying and imploding into a black hole, and the ships of their exodus fleet were on the verge of falling to pieces from attrition of their long voyage by the time they reached the Equusian star system, making a trip to an alternate uninhabited planet impossible. They didn't want to invade, but have no reason to believe Equus would accommodate them given their history of fighting back against so many alien invasions and their scouts being killed and vivisected by the Defenders of Equus, leaving them with little choice but to make a desperate shot to take Equus by force.
Lost Technology: Much of their technological advancements ended up becoming this: Their exodus fleet were hastily constructed and barely able to carry a fraction of their people and infrastructure, forcing them leave much of them behind to be swallowed by the black hole their collapsed sun had become. With no FTL drive, their ships were forced to cruise to their destination at sub-light speeds for thousands of years, their passengers kept alive through cryogenic suspension and time dilation, but system malfunctions, crew insanity, cosmic disasters and other problems took out much of their brighter minds and more qualified personnel and forced them to cannibalize their own vessels to keep them functioning. When they were forced to invade, they pretty much utilized nearly all of their remaining tech and advanced materials to build the trump cards the Mecha-Dracozillas, while their military personnel died to an ape in their Last Stand when their desperate conquest went awry. All these losses in apes and materials pretty much wiped their technology base, and from the testimony of one Obez'yanan technician, most of them don't even know how their sanitation systems work anymore, nevermind one of their advance Nova Engines, and would have to restart from scratch, unless the Equusians themselves figure out how to access the sole remaining Datacore that one of the Beyonders managed to acquire before their invasion base blew up.

General Black Marsh

Anti-Villain: He doesn't want to invade Equus, nor is he really a bad person. It's just due to circumstances outside of his control and their scouts being captured, killed, and vivisected by the Defenders of Equus on top of past invasions of the planet, he feels he has no choice.
Big Bad: Serves as this of 'The Mechanical Dragon' event.
Freudian Excuse: He saw his planet and solar system destroyed and due to a progressive series of disasters went from a cadet to their leader simply because everyone higher in rank died. He's desperate to save his people and everything he'd seen of Equus, including having his scouts killed and vivisected, convinced him peaceful first contact wasn't happening.
Start of Darkness: His backstory is detailed in the form of his log book at the beginning of the second entry of the 'The Mechanical Dragon' Event: he was a cadet when his kind had to flee their dying planet as it was sucked into the blackhole their planet had imploded into. Over the 5000 year journey (kept alive due to time dilation and cryogenic freezing), his superiors gradually died off leaving him promoted until he became their leader. After learning of Equus's history and having his scouts vivisected by the Defenders of Equus, he believed their only hope for survival was to launch a desperate invasion using the MechaDracozillas.
Tragic Villain: He's not a merciless conqueror, rather he's a desperate ape trying to keep his people alive by any means necessary and genuinely feels he has no choice but to invade Equus. He dies sacrificing himself to give Daydream the means and time to save his species' civilians.
You Are in Command Now: When the Obez'yanans started their exodus, he was just a cadet. His superiors all died on the journey, leaving him the highest-ranking military officer left.

Mecha Dracozilla

Evil Knockoff: It's a mechanical duplicate of Dracozilla designed to be the vanguard of their invasion.
No Plans, No Prototype, No Backup: Subverted: the Obez'yanans have every intent of mass producing an army of them after getting enough resources to do so. They manage to get one nearly operational which Fizzlepop hijacks and uses to revive Dracozilla.
Rasputinian Death: It's destroyed by Dracozilla blasting it multiple times with his Spiral Fire Ray, badly damaging and melting parts of it to slag, has its chest and metal bashed in by Caesar, has its head torn off and is sent crashing into the Obez'yanans' base hard enough to cave in the mountain. Dracozilla then finishes it off with a barrage of Spiral Fire Rays until its nothing but molten slag and blazing wreckage.
Walking Armory: It wouldn't be an Expy of MechaGodzilla if he wasn't covered in ordinance.

The Orks

(Their entry here

)

General

Affably Evil: A Xenos/Alien/Visitor race of green-skinned warmongering savages and proud of it, but only because they were literally made to be this by the long-vanished Old Ones. For them, making war was as natural as breathing and something they greatly enjoy, and they quite literally cannot understand why the other races do not think the same.
Ax-Crazy: Even the nicest of them is still a bloodthirsty psychopathic lunatic by everyone else's standards. Depending on the situation that makes them either horrifying or hilarious (or both)
Battle Thralls: They were made to be the ultimate example of this by the Old Ones over 60 million years ago for an impossibly vast galactic conflict that dwarved anything the galaxy experienced for much of its history. They survived and prospered even after that conflict ended and their masters vanished/perished, and had been terrorizing the galaxy ever since.
Beware the Silly Ones: Queen Majesty warned that while the Orks are crude, violent, savage, fraturous and proud of it, their strength, resilience, cunning and unpredictability make them remarkably dangerous, on top of the fact they were made to be the ultimate Battle Thralls and even after 60 million years of degeneration they are still among the most successful and dangerous races in the galaxy and one of the greatest threats to even the galaxy-spanning Imperium of Ponykind back in the day. Many Ponies and other races back then who made the mistake of underestimating them would end up ruing their folly upon finding themselves decimated by an Ork WAAAGH.
Beyond the Impossible: Around half the race is now aligned with Telluskind/Equuskind after Queen Majesty proved herself to be stronger and hence 'Bigga' than any warlord of their kind by destroying the Malignant Powers and repealing the 'Law of Despair' responsible for the extremely brutal and fatalitically war-torn environment of the distant past, something which nothing they do could possibly top. This left a then-disguised Golden Scepter absolutely stupefied when during the interstellar era of the Second Age he witnessed an Ork WAAAGH! saving a Tellusian fleet in deep space from another group of hostile aliens, and then went off to fight elsewhere without harassing them.
Blood Knight: Aeons ago, the 'Old Ones' created the Ork race to be the ultimate warriors, capable of surviving any condition and overcome any foe, and despite of 60 million years of degeneration they are still one of the most dangerous and successful races to terrorize the galaxy, constantly warring amongst themselves and fighting everyone else due to their genetically hardcoded desire and NEED for war and battle. Notably, Majesty managing to redeem half the race was less getting rid of this trait and more directing it towards more constructive and less villainous ends, such as extremely violent sports.
Captain Ersatz: Due to an Expy of the universe being part of the Codexverse setting (albeit in the distant past instead of the far future), the Orks are lifted straight from Warhammer 40,000 with some minor modifications.
Comedic Sociopathy: As Queen Majesty noted, even the 'nicest' Ork is, by everyone else's standards, a bloodthirsty psychopathic lunatic. That being said, they are as much a danger to themselves with their shenanigans as they are to everyone else, making their antics hilarious when not horrifying.
Dented Iron: It should be noted that as dangerous as the Orks are now, they were a far-cry from what they once were 60 million years ago due to ages worth of degeneration. They are still one of the most successful and dangerous races in the galaxy, one which prospered in and even enjoyed the grimdarkness of the 'Imperium Era' and are still marauding across the galaxy today, and certain events showed that they could go back to the pinnacle of what they once were under the right circumstances.
The Dreaded: As a barbaric warlike race who are literally wired to wage war and had survived and terrorized the galaxy wiping out whole civilizations (and each other) for fun, they are naturally this. An Ork WAAAGH! appearing during the Second Age was enough to terrifying Tellusian Ponykind into thinking a war of an apocalyptic scale was coming.
The Horde: Like their canon counterparts, they are this, full-stop. While often fighting amongst themselves, when a mighty and charismatic leader comes around to unite the fractious Ork tribes and 'Klans' for war, they could embark on what they call a 'WAAAGH' - a mix of a migration, a crusade, a drunken pub crawl and a war of pure aggression could devastate entire star sectors and wipe out whole civilizations in rapine and slaughter.
Might Makes Right: Their whole race runs on this. By design, Orks get bigger, stronger, smarter and meaner the more they fight and the longer they survive and win, and the biggest and baddest among them become their 'Warbosses' and 'Warlords' around which Orks instinctively obey and rally around thanks to their racial gestalt 'WAAAGH' field, following the Warboss/Warlord into finding and fighting wars which in turn make them even bigger and stronger and more aggressive in a positive feedback loop. At least half the Ork race came to respect Queen Majesty and stopped harassing Tellus/Equuskind because of this mindset, as they saw her feat of destroying the Malignant Powers and repealing the 'Law of Despair' trapping the galaxy in a downward spiral of unending war, suffering, corruption and madness as a feat beyond anything they had or could ever pull, making her 'Bigga' and stronger than they are by default.
We ARE Struggling Together: One of the saving graces when it comes to the Orks is that they love waging war on each other as much as they like fighting everyone else, and their fracticious nature had prevented them from stomping the whole galaxy flat in an endless green tide of choppas and dakkas. Today half the race aligned with Telluskind/Equuskind thanks to Queen Majesty's deeds largely keeps the other half in check.
Worthy Opponent: The Orks' Might Makes Right philosophy made them respect opponents who show themselves to be stronger and 'bigga' even at their worst. Queen Majesty exploited this to eventually befriend half the race by beating opponents so powerful in such a thorough manner that none of them could ever hope to top it, earning their permanent undying respect.
- During the 'Second Age', Orks on both side of the hostile/non-hostile-to-Tellus divide came to regard Queen Victorious Princess with reverence from her sheer bloodlust and the carnage she left in her wake as she wage an eternal war against other monsters, to the point she came to be regarded as a non-Ork emissary of their gods Gork and Mork themselves. Many consider fighting against her as an honour and great fun, launching whole WAAAGH!s towards her general direction in hopes of running into her, and their Mekboyz and Warbosses often made or commissioned the biggest, baddest, most 'Dakka'-proficient 'Shootas' they could, as a word of appreciation from her over the designs is seen as enough of a great honour as it is to fight her (and other Orks) with it. Victorious Princess for her part just roll with it to keep them harming innocents and occasionally get an army of trigger-happy noggin' chopping green-skinned super-soldiers behind her back if she needs it.

Human World/Terra

General

Alternate Self: Everycreature in Equestria has an alternate counterpart in this world.
Muggles: The majority of lifeforms on this world have no actual magic to speak of. They can, however, gain it if infused with enough that they mutate a Magic Core.
Wild Magic: It's noted that magic sent into this world from Equestria behaves much more wild and emotion-driven than it does in Equestria. This makes it less well understood and harder to control.
Wrong Context Magic: Magic brought here from Equestria functions completely differently than it does in Equestria itself, making it somewhat alien to both worlds.

Twilight Sparkle/Sci-Twi

Deity of Human Origin: Would eventually become a demigoddess, similar to her counterpart.
Mind over Matter: She has both telekinetic and matter transmutation abilities.
Omni Disciplinary Scientist: Sci-Twi ends up with degrees in computer science, robotics, electrical and mechanical engineering and physics.
Teleportation: Learned how to teleport like her equestrian self.

Rainbow Dash

Rarity

Midas Touch: Has gained a controlled version of this.

Fluttershy

Pinkie Pie

Applejack

Megan Williams

Alternate Self: She's the alternate universe version of Megann, the Rainbow Empress.

Pippa

Hero of Another Story: While the events of the Equestria Girls series were happening, she was having the events of the Princess Ponies books.
Related in the Adaptation: She and Megan naturally don't have any canon relation. Here, she's the cousin of the human world's Megan.

Trixie Lulamoon

Achievements in Ignorance: Found a magic tome by accident while in the library.

Officer Chrysalis

Mentor Archetype: Her job as a police instructor makes her this to Sonata Dusk, who decides to join the Police Academy.

Chevalians

General

Bigger on the Inside: Like the Giant Lands, the magical distortions make Chevalia larger on the inside than it appears on the outside.
Crossover: Is the setting of a series of children's fantasy adventure books called Princess Ponies, the events of which happened here.
The Fair Folk: They may be classified as Fae, possessing natural magic when most things in the human world do not, have a Perception Filter, and they and their country both have a 'whimsical' nature associated with Fae. It's also noted due to the human world lacking magic normally, they might qualify as Fae there, even if they wouldn't in Equestria.
Human Subspecies: Subverted. Sunset initially suspects them to be Equestrians who came through the portal and became this, but they're the result of magically influenced convergent evolution.
Magical Land: Chevalia is the result of Equestrian magic leaking into the human world through a natural portal for centuries or even millennia. As a result, it's one of the only places in the human world magic naturally exists and has various magical qualities, such as a Perception Filter, magical creatures, and time dilation.
Perception Filter: Their island is protected by one that means only someone who loves equines can see it. This also allows them to understand them. Comically, due to Sunset Shimmer being a pony, anyone who cares about her can see it.
Related in the Adaptation: Chevalia and Equus have no connection in the lore (except perhaps the former taking inspiration from the latter), but here magic leaking from the latter resulted in the creation of the former.
Translator Microbes: Chevalia and its inhabitants' Perception Filter allows anyone who's capable of actually seeing it to understand their language and vice versa. This is handy, as their native language is completely different than English/Ponish.
Uplifted Animal: The Chevalians come from the human world, being wild horses that had their evolution influenced by magic leaking through from Equus via a natural portal until they became a species of sapient horses.
Wrong Context Magic: Chevalians naturally possess magical cores due to Equestrian magic influencing their evolution. Everything else in the human world lacks one unless they're mutated by Equestrian magic enough to gain one. It's also presently unknown how their magic actually works.

King Firestar

Queen Moonshine

Princess Stardust

Pippa

Miscellaneous

'Illusive Imitation'

First mentioned in a Drabble

, 'Illusive Imitation' is the assumed identity of a mysterious alien being from the stars who arrived ages ago to infiltrate, assimilate and propagate itself within the world's biosphere, but changed his mind after his initial rampages were stopped and he acquired sapience. Despite his terrifying abilities and apocalyptic potential, he has elected to coexist with Equusian life and is presently working with the Equus Sentienels to safeguard Equus from other 'Visitor' threats as well as counter fanatical crusades and machinations of the xenophobic Equus Defenders.

Alien Invasion: He started one back in the 'Second Age' when the spacecraft carrying his past-self (after assimilating its alien crew) crash-landed in the Arctic, followed by him awakening and rampaging in two separate arctic installations before he was discovered and captured. He stopped the invasion once Dr. Silversmith and other scientists' efforts to study and contain him granted him true sapience and made him decide to pull a Heel–Face Turn in both sincere gratitude and survivalist pragmatism.
Aliens Are Bastards: Initially, during his arrival and rampage in the Arctic, though in his defense he was still a somewhat simple-minded entity who was compelled by his biological instincts to assimilate anyone and anything not like himself. He stopped being this trope after being granted true sapience by Dr. Silversmith and deciding to pull a Heel–Face Turn.
Animalistic Abomination: Despite his Pony guise, 'Illusive Imitation' displays from his words alone an inequine character in terms of both behaviour and mindset. This is understandable considering who and what he actually is: a shapeshifting alien horror which can assimilate any living lifeform and imitate their shape and mannerisms with near-perfect accuracy.
Apocalypse How: Illusive Imitation's true nature as The Assimilator is so dangerous, it had been estimated that had his old aggressive assimilator self been allowed to cut loose, he could assimilate all life on Tellus/Equus within 27,000 hours (i.e. roughly three years). Fortunately, thanks to Tellus back in the 'Second Age' being much more advanced and prepared, it is unlikely to be that successful, and his Heel–Face Turn after being captured and being altered by Dr. Silversmith ensures that far from causing it, he would actively aid in preventing such an occurrence caused by other aggressive assimilator 'Visitors'/aliens.
Arch-Enemy: He had been hunted by the xenophobic and xenocidal Defenders of Equus for quite some time, and had noted in many ways he was and still is their worst nightmare regarding 'Visitors' between his ability to infiltrate and assimilate anyone as well as his potential apocalyptic threat had he not pulled a Heel–Face Turn. The Defenders of Equus' decision to come out in the open and work with other nations to fight Visitors and Lost Ones compelled him to meet with the Equus Sentinels and offer his support and services.
The Assimilator: What he truly is: A shapeshifting alien Body Horror from the stars who can infect and assimilate any other lifeform into copies of themselves, infiltrating and propagate into the biosphere of any life-bearing planet he arrived in, able to cause a planetary apocalypse within years by spreading worldwide. Fortunately, he decided to choose a more commensalistic/symbiotic relationship with Tellus/Equus after the initial horror shows.
Blue-and-Orange Morality: Downplayed from depiction so far, due to it being less pronounced thanks to being given Pony-like sapience and intelligence, as well as being a master imitator by nature allowing him to fit in among Ponies and non-Ponies. He's still an alien horror from the stars, though, so some of his thinking processes and subsequent worldview is fundamentally different and strange as a result.
Body Horror: By his very existence as a shapeshifting alien horror which can assimilate any living lifeform and imitate their shape and mannerisms with near-perfect accuracy. Could also invoke this for psychological warfare purposes by leaving behind gory remains of those whom he had assimilated and killed, which are twisted in ways which defies conventional Equusian biology.
Creepy Good: While he looks like a Pony, he is in reality a shapeshifting alien horror from the stars who could assimilate and imitate any living creature near-perfectly and infiltrate any environment or group to assimilate and propagate itself as he was biologically compelled to, making him a terrifying monster whose very existence has potentially apocalyptic consequences for any world he lands on if he cuts lose. Fortunately, thanks in part to gaining sapience allowing him to transcend his original animalistic instincts, he has decided to coexist with Equuskind and is presently working with the Equus Sentinels.
The Dreaded: His repute preceded him after his initial rampage in the Second Age. One of the Virtuous Seven present in the meeting with Commander Tempest Shadow of the Equus Sentinels immediately has an Oh, Crap! moment when she realizes Illusive Imitation is none other than the shapeshifting alien horror that destroyed those arctic installations and massacred most of the researchers there back in the 'Second Age'. In the Equus Sentinels, he ties with Joyous Princess as their deadliest and most dangerous members.
Enemy Mine: Illusive Imitation decided to join the Equus Sentinels partly because the Equus Defenders, who had been hunting him for centuries, had decided to come out into the open and he decided it would be in his interest to help their benevolent counterparts out.
Expy: Is all but confirmed he's a non-hostile version of the titular monster of The Thing (1982).
From a Single Cell: His true nature grants him incredible regenerative healing and durability, as well as allow parts of him, down to the cellular level, to be detached and operate like their own organisms under his control. All this allows him to survive so long as even a single cell is intact. This necessitates excessive application of fire or explosions to fight him by his opponents, as the total annihilation of every single part of him is the only way he could be thoroughly and utterly destroyed.
Good Is Not Nice: He may be an aggressive alien assimilator who decided to coexist peacefully with Equusian life, but he is still an aggressive alien assimilator by nature, and it shows when he has a reason to act as he was back when he was a single-minded xenobiological horror compelled to assimilate and propagate among other lifeforms.
Heel–Face Turn: After his past self, then a simple-minded alien horror compelled by his biological imperatives to infiltrate and propagate in the biosphere of the worlds he arrive in until everyone and everything is assimilated, is discovered and captured, Dr. Silversmith's efforts to study and contain his threat resulted in him being granted true sapience and Pony-like intelligence. Silversmith's persuasive arguments that it is more logical and beneficial to coexist with Telluskind/Equuskind for long-term survival than to just assimilate everyone, as well as his own gratitude for being able given the chance to become more than what he was, resulted in him deciding to live among and even help Sapientkind of Tellus/Equus rather than causing a global apocalypse by infecting and assimilating every living thing.
Hive Mind: One of the alterations from his past self allows all his cells to operate under one, and is essentially one in his entirety, unlike his previous form where once detached each cell and tissue of himself operates as its own organism. This is convenient for him to prevent parts detached from him from going on rampages and accidentally cause a global apocalypse.
Humanity Is Infectious: In his case, Ponykind is infectious, as it was a Pony scientist (Dr. Silversmith himself) who gave him true sapience and free will, allowing him to transcend his biological imperatives and become more than just an aggressive alien assimilator.
It Can Think: While his original self can already do so by assimilating his victims, being altered by Dr. Silversmith grants him true sapience and intelligence. Fortunately, this also allows him to overcome his original nature and become more than the alien monster he once was, allowing for a Heel–Face Turn.
Kill It with Fire: Retains this weakness owing to the only change from the organism he once was being giving Pony-like sapience and intelligence, and given his abilities is the only reliable and practical way to kill him.
Manipulative Bastard: Thanks to his abilities making him a near-perfect infiltrator and assassin, he could easily create chaos, distraction and paranoia among those he is infiltrating by infecting, assimilating and imitating as members of their kind, leaving them divided and unable to trust anyone as well as making it easier to make them act in ways to his favour. Best shown in a drabble where he managed to cause an entire base of Autorist Griffons he's infiltrating to panic, and in desperation obeying an order to disarm and chain themselves up in a sealed army base hall so they could be personally screened by their commander... unaware that the commander himself had already been infected and being manipualted from inside him by Illusive Imitation, leaving the Autorist troops horrified and helpless when Illusive Imitation emerged in his true terrifying form to slaughter them all with no means for them to defend themselves or escape.
Mook Horror Show: In a terrifying demonstration of Illusive Imitation's deadly potential, he infiltrated a Griffon Autorist base housing alien artifacts that cannot be allowed to fall into their claws, and proceeded to systematically ambush, kill, devour, infect and imitate the Autorist troops, personnel and guard animals by himself or his detached parts, sabotaging and isolating the base and leaving the Griffon Autorists confused, horrified and paranoid wrecks as their comrades die or disappear one by one or suddenly turning on them for no reason, culminating in him tricking them all the remaining into disarming and binding themselves in a single spot for him to emerge in his true form and slaughter them all.
Mysterious Past: Even he has no idea where he came from. All he can remember is that his past self arrived on Tellus during the 'Second Age', wiping out several arctic research installations and its people before he was discovered and captured, and pulled a Heel–Face Turn after Dr. Silversmith's efforts to study and contain him granted him true sapience. He speculated that he either came from a Death World where all lifeforms evolved into alien horrors like himself naturally to survive, or he was artificially created by someone else to serve as a biological weapon.
Pragmatic Hero: His reasoning to live peacefully among and even aid Tellusian/Equusian sapientkind: On top of gratitude for the lifeforms which allow him to become more than what he once was, Just as natural selection of most microbes in RL leans strongly towards commensalism and symbiotic relationships with their hosts rather than continue being pathogenic for long-term survival, he realizes that maintaining a commensalistic and even symbiotic relationship with Tellus/Equus is more beneficial to his survival and propagation. True to Dr. Silversmith's persuasive arguments, he was right, surviving from the Second Age to the present day.
Stealth Expert: Is considered the best infiltrator, full-stop, in the Equus Sentinels organization. Best shown in a Drabble where he infiltrated and systematically neutralize an entire Griffon Autorist base with the Griffon Autorists being unable to catch him in any way (even after they figured out who or what is causing it) until they were all killed.
The Stoic: He is unnervingly collected and composed in his meeting with the Equus Sentinels where he offered his support and services, emphasizing that despite his seemingly equine appearances he is anything but.
They Look Like Us Now: Can invoke this on account of being a shapeshifting alien horror which can assimilate any living lifeform and imitate their shape and mannerisms with near-perfect accuracy. He can infiltrate anywhere and pretend to be anyone, making his opponents and targets impossible to know who to trust and who to kill.
Ultimate Life Form: Competing with Joyous Princess, with whom he is presently a colleague in the Beyonders. His true nature is a highly-complex aggressive assimilator and invasive imitator organism who can adapt to any environment and reproduce by assimilating any living thing which he come into contact with into copies or part of itself. His virulent cells are capable of infecting and converting other cell at astonishing speed at the slightest contact, taking whatever traits, memories and information from it which allow the wider organism or its detachments to assume their likeliness and imitate their behaviour. His shapeshifting abilities can allow him to imitate any complex living organism, regenerate from extensive injuries and survive so long as even a single cell remains. The only reliable method of destroying him would be to literally burn or blow up every part of him with considerable amounts of fire and explosions - and that's assuming his opponents can find him and figure out which one of them has he taken over or in disguise. Had he not been contained, his invasive past self could had wiped out all life on Equus/Tellus by himself within little over three years.

'Jade Fiends', the Scourge of the Taotie Comet

Captain Ersatz: Of the reptilian 'Tao Tei' aliens that invaded Song Dynasty China in The Great Wall.
Great Offscreen War: The epic conflict between the [REDACTED] Dynasty in the Qilin lands of the Orient and the Jade Fiends was mentioned completely in passing in the 'Defenders of Equus' entry.
Hold the Line: What the [REDACTED] Dynasty had to do in the face of the Jade Fiend scourge.
Noodle Incident: Mentioned as one of the ancient Equusian-'Visitor' conflicts in which the 'Defenders of Equus' intervened with.

The Silim

First mentioned in the 'Defenders of Equus

' entry, in the backstory of the organization, centuries ago an incursion by the mysterious 'Silim' race nearly destroyed the Unicorn kingdom in which Sir Grand Defender, founder of the Defenders of Equus, lived and served. The Guilt-Free Extermination War and Pyrrhic Victory that followed convinced Sir Grand Defender and what's left of his knights and kingdom that all alien beings and influences are a threat to Equus. Swearing to never again let any other place on Equus fall to the same tragedy, the aftermath of the 'Silim Incursion' set Sir Grand Defender and the other survivors down the path to creating a Ancient Conspiracy dedicated to fighting and destroying all and any outsider influences, be they alien, demonic or eldritch.

Alien Invasion: Both the secret infiltration and all-out attack variety, as the Silim life-cycle seemed to involve a meteor which somehow causes an 'infiltrator' to be created inside the local planet's population, who would mingle in disguised as one of them and compelled to mate with a member of the local species. Once it successfully does so, it rapidly reproduce a huge number of hybrid spawns which would then proceed to attack and destroy every other non-Silim life.
Aliens Are Bastards: The Silim are hostile to all Equusian life and sees them only as a means of reproduction and a threat to be exterminated. As Sir Grand Defender and the rest of the kingdom discovered, nothing short of their total annihilation is needed to purge them from their lands. The only subversion of this trope so far from the Silim comes from one genetically-perfect 'hyper-evolved' Silim/Pony Hybrid named Joyous Princess.
Always Chaotic Evil: The Silim Hybrids are incorrigibly hostile to all non-Silim life, and seeks nothing less then their total subversion, consumption or annihilation. As far as Sir Grand Defender and his knights are concerned, they are this trope. Subverted with the notable example of Joyous Princess, a genetically-perfect 'hyper-evolved' Silim/Pony Hybrid who is neither hostile to Equusian life nor interested in propagation.
Bizarre Alien Biology: The Silim are a race of brood parasites with a very unusual life-cycle. The Silim Incursion began with a meteor, inside which was a mass of alien colours which dissipated and somehow caused a local Unicorn mare (the formerly barren queen of the kingdom) to conceive an 'Infiltrator'. This infiltrator is then compelled to breed with another local stallion, creating hybrid offsprings. The hybrid offsprings, incorrigibly hostile to all other non-Silim life, proceeded to spread out and ravaged the kingdom. There is no information regarding the later stages in the Silims' life-cycle as they were all killed by Sir Grand Defender and the survivors of the kingdom before they reached those stages.
Came from the Sky: Arrived centuries ago in this manner in the form of a mysterious meteor with strange colours inside which somehow caused the barren Queen of the Unicorn kingdom it landed in to conceive 'The Infiltrator', who then proceeded to breed hybrid offsprings which then went on to ravage the kingdom.
Composite Character: The Silim race is an unholy fusion of the eldritch Colour of The Colour Out of Space and the Sil from the Species series.
Evil Is Sterile: Literally. One of the few miraculously good fortune coming from the whole disastrous 'Silim Incursion' had been that the Silim Hybrids produced by 'The Infiltrator', unlike their parent, are themselves completely incapable of reproducing themselves for some unexplained reason. The hyper-evolved genetically-perfect Hybrid, Joyous Princess' example and claims hints that it may had to do with them being genetically-flawed/imperfect and that the Silim Hybrids are, in fact, capable of reproducing, and could resist their nature enough to be not incorrigibly hostile to all other non-Equusian life on top of that.
Face Full of Alien Wing-Wong: The Silim produces hybrid offsprings with local sapients as part of their lifecycle.
Giant Space Flea from Nowhere: No one has the slightest clue as to what they are or where they came from, only that they arrived with a mysterious meteor which fell from the skies, releasing a colour out of space which subsequently induced pregnancy with a Unicorn Queen who was known to be barren, creating 'The Infiltrator' who bred with a local stallion and created incorrigibly hostile hybrid off-springs, which proceed to nearly overrun the lands and slaughter every-pony before they were put down.
Guilt-Free Extermination War: With their utter hostility to all non-Silim life once they got to the 'explosive hybrid breeder' phase, Sir Grand Defender and the rest of the kingdom had to wage one in order to save their lands from rapine and slaughter - well, what's left of them anyhow.
Godzilla Threshold: The threat of the Silim was so extreme that Emperor Golden Scepter, who had been monitoring the situation, confirmed that had Sir Grand Defender and the kingdom failed to contain the threat, he would have to use an 'Imperium Era' Exterminatus-grade weapon he have in storage to cleanse the entire region they're attacking just to be absolutely sure they're all wiped out. Fortunately, Sir Grand Defender and his knights were able to wipe them out, making it unnecessary for such an extreme measure. Golden Scepter noted his xenophobia in the Imperium Era was partly because there are things like the Silim out there in the cosmos that completely justify/necessitates total destruction, because NOTHING less could stop them from terrorizing/destroying everyone else.
Start of Darkness: For the "Defenders of Equus" faction. The survivors of the kingdom ravaged by the Silim, led by Sir Great Defender, vowed to never let the tragedy which befell them happen to anywhere else, and would go on to form a secret Ancient Conspiracy of Knight Templar crusaders dedicated to defending Equus from all 'outsider' forces and influences, whether they came from outer space or other dimensions. They would secretly fight, contain and destroy many hostile 'outsider' threats over the ages, but also persecuted many innocent or peaceful victims whose only crime was being exposed to 'outsider' influences or even have 'outsider' heritage.
Zerg Rush: The Infiltrator's hybrid offsprings bred EXPLOSIVELY, allowing them to nearly overrun the kingdom her/it and they were born in.

'The Infiltrator'

Aliens Among Us: "The Infiltrator" was born to the Queen of the kingdom (who was previously sterile) after a mysterious meteor fell from the sky earlier onto the land. Disguised as one of the local Unicorn population, she/it was compelled to mate with one of the Unicorns, whereupon she produced whole generations of hybrid offsprings which proceeds to nearly overrun the kingdom.
Humanoid Abomination: Technically equinoid as 'The Infiltrator' disguised herself/itself as a Unicorn mare, the princess of the kingdom's previously barren Queen, but it's clear that it is utterly alien in biology and in true, mature form.

Joyous Princess

First mentioned in a drabble here

, Joyous Princess is the only member of the Silim race still alive on Equus, and is a hyper-evolved and genetically 'perfect' specimen who unlike her kin have no interest in propagating and just wanted to be left alone. She is presently working with the Equus Sentinels as a member of the Beyonders, hoping this would help to prove, once and for all, of her peaceful intentions and put the fears of the rest of the world to rest.

Action Girl: Being a genetically perfect Silim hybrid makes her powerful and deadly even by the standards of an already deadly species. Even while holding back and not using lethal force, she's capable of effortlessly taking down trained soldiers.
Always Chaotic Evil: Subverted unlike the other Silim: Joyous Princess is a genetically-perfect 'hyper-evolved' Silim/Pony Hybrid who is neither hostile to Equusian life nor interested in propagation. She lacked her kind's desires to reproduce due to the absurdly high 'genetic perfection' threshold her instincts demands for her mate, and also because she willingly sterilized herself to save a Pony friend of hers. She even personally eliminated most of the remaining Silim survivors herself at some point in the past, and as far as she is concerned simply desires to be left alone rather than being out to hurt anyone. Her example and claim opens the possibility that the overwhelming imperative to breed and wipe out all non-Silim life may had been due to 'flawed' genetics of the hybrids in question rather than some ingrained desire and/or innate hostility.]]
Blue-and-Orange Morality: Joyous Princess seemed confused by the embarrassment others have for her casualness regarding her love and sex life as well as lacking the general hesitation to resort to deadly violence when necessary that other Equusians possess, on account of her alien mindset. That being said, she does notice it and acts accordingly out of consideration of others' comfort.
Body Horror: Her tongue alone can lash out like a deadly whip with enough strength to punch a hole through a Griffon's head, and pensile enough to toss the body into a cabinet.
The Dreaded: On top of her super-equine abilities, she is descended from a race of 'Visitors' which devastated a kingdom and is seemingly incorrigible to all life on Equus, despite repeatedly insisting that she has no intention to breed or kill everything not herself and even eliminated most of her remaining Silim survivors herself so she could coexist peacefully with the rest of Equuskind.
Heinz Hybrid: Like the rest of the Silim, which produces hybrid off-springs with local sapients as part of their life-cycle, Joyous Princess is a genetically-perfect and hyper-evolved example of them.
Horrifying Hero: She is presently a member of the Beyonders team of the Equus Sentinels, using her abilities for good by helping the organization protect Equus from hostile 'Visitors' while also ensure peaceful interactions with non-belligerent "Visitor" visits and First Contact. Her Silim nature makes her much more horrifying than the average Terror Hero.
Ultimate Lifeform: She's a genetically 'perfect' Silim hybrid. This makes her considerably stronger than her "imperfect" brethren, but makes her have no desire to propagate, as her genetic thresholds for a mate are so absurdly high next to nothing meets them, and her "perfect" mate created for her is sterile, as is she (of her own accord).

Cerebrum, the Planetary Illness

Omnicidal Maniac: He considers manipulating civilizations into destroying themselves a game.

Millennian

Millennian (introduced here

) is a Hive Mind alien intelligence accidentally awoken by deep sea exploration which would go on to be one of the final threats of the Time of Trials.

Expy: It's naturally based off the Millennians. From Godzilla: New Era, used with Tarbtano's permission.

Characters / Codex Equus The Visitors

The Visitors

Celestial Ponies

Classification: TBA

Portfolio: TBA

Rank: Antecedent

Classification: TBA

Portfolio: TBA

Rank: Antecedent

The Reptilians

Giants of Light

Maretians

Venerans

The Mobuli/'Space Manta Rays'

The Kirko

Deliverance Brood

Obez'yanans

The Orks

Human World/Terra

Chevalians

Miscellaneous

'The Infiltrator'

Joyous Princess

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Index

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Characters / Codex Equus The Visitors

Edit Locked

The Visitors

Celestial Ponies

Classification: TBA

Portfolio: TBA

Rank: Antecedent

Classification: TBA

Portfolio: TBA

Rank: Antecedent

The Reptilians

Giants of Light

Maretians

Venerans

The Mobuli/'Space Manta Rays'

The Kirko

Deliverance Brood

Obez'yanans

The Orks

Human World/Terra

Chevalians

Miscellaneous

'The Infiltrator'

Joyous Princess

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Index

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