My Hero Academia: The Return Of The King

Aliens

Leaders
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Xemos: Xemos is the leader of the Xiliens Xemos should have but also has this cunning and calculating mind, something that Xemos should have as the leader of the Alien Alliance as I call.

Galatea: Galatea is the matriarch of the Kilaaks. The Kilaaks' species  Anyways, as far as a human disguise goes Galatea gorgeous but she's also dangerous as she is extremely cunning as well. These are traits that apply well to Galatea's Galatea is an romantic relationship with Xemos.

Kabuto: Kabuto is the "representative" of the Nebulans. The Nebulans in their true forms has this feel like you know something's a miss about him but at the same time doesn't look he could harm a fly. And that's what makes him so dangerous.

Antonio: Antonio is of course the emperor of the Seatopians and they came from a world VERY similar to Earth hence why they natural look more human. The big difference biology wise is that they have gills on the side of their necks which close when on land to the point where you'd never even know their there. The Seatopains came to Earth at some point thousands of years ago and have been living at the bottom of the sea since. They also discovered Megalon at some point and he has since become their guardian. Antonio because he's young, hot-blooded and cares for his people. Antonio is tired of the humans destruction of the planet, especially the oceans and ultimately believes we don't deserve anymore chances, and allies himself with the Alien Alliance. I'm not gonna discuss too much about that but bad things happen to Antonio...

Mugal: Last and certainly not least, we come to Mugal, the militaristic leader of the Simians, Strong, cunning, ruthless.

Ailen Races
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Xiliens - Cyber like skeletal alien race that has technology to control kaiju to conquer worlds.

Killaks - Feminine robot beings, piloted by space worms, that have the power to control kaiju and people.

Nebulons/Seatopians - An insectoid race who can create techno organic kaiju.

Simians - Alien primates with great intelligence and creativity to create robotic kaiju.

Millenniums - Shape shifting liquefied beings that can combine into a huge jellyfish like creature and try to adapt a new home by absorbing DNA.

Devonians - Fish like amphibian beings that travel to earth long ago as they might have something to do with Seatopians, since they look similar.

Cryogs - Shape shifting tyrannical aliens who desire to conquer worlds by creating an army of kaiju like Trilopods.

The Cryog are a race of shapeshifting, sentient cephalopod-like aliens who were forced to abandon their home planet after it was rendered uninhabitable by King Ghidorah. Now, these nomadic conquerers seek to make planet Earth their new home and they are willing to exterminate the human race to accomplish this. The Cryog were initially led by Commander Rhizon, but in the midst, their true ruler, Emperor Karkaro, arrived to take command.

In their natural form, the Cryog have a very unique physiology. Instead of legs, they have multiple tentacles sprouting from their 'waists', which they use to keep them standing and moving upright. At the shoulders they have a pair of fully-prehensile tentacles that they use as arms. Their heads are pointed at the top and they possess two human-like eyes and a single mouth filled with multiple rows of sharp teeth. Their eyes are normally red with yellow irises. The Cryog's skin-tone ranges from blue to purple among males, and green to brown among females, while Emperor Karkaro's skin is dark red.

Their people do not seem to wear any sort of clothing, aside from scanners they occasionally wear over their eyes, although Karkaro appears to wears a long black robe with large red buttons shaped like eyes. However, the Cryog do possess large, intricate formations on their bodies which seem to denote rank or status. Most of the lower-ranking Cryog soldiers have triangular armour-like formations on their upper bodies. On males these formations are smooth-edged and mostly the same colour as the rest of their bodies. On females they are more jagged and vary in colour, with green-skinned females having bright yellow formations and brown-skinned females having orange formations. Commander Rhizon, instead of a triangular formation, possesses an ornate frill extending from his upper body to behind his head, indicating his higher rank. Karkaro, as Emperor, stands considerably taller than the rest of his kind, has a circle of horns on his head that resemble a crown, and a massive spike-covered frill surrounding his head and upper body. Karkaro's elite guard dress in silver armour and wear helmets with single glowing red eye slits, resembling the face of Gigan.

All Cryog possess the inherent physiological ability to shapeshift into other sapient races, including humans. With enough practice, and a certain level of talent, a Cryog is able to imitate any individual they can visually perceive, perfectly matching that person's height, voice, unique physical characteristics, and even copying their clothing. This makes it very easy for them to infiltrate their enemies in order to manipulate and destroy them from within. This shape-shifting even applies at the genetic level, allowing Cryog agents to fool DNA testing. The only limitation is that while a Cryog can perfectly imitate the appearance of another being, they cannot copy that being's memories or personality. To compensate for this, Cryog infiltrators are trained to first observe a target in order to learn their mannerisms and habits before replacing them.

Technologically, the Cryog are far more advanced than humans. They possess large starships capable of long-term space travel and their soldiers are armed with energy weapons. Their ships appear to be bio-mechanical in nature, with organic-looking exterior armour and some even possessing tentacles. Cryog spaceships also possess advanced stealth capabilities, being able to easily hide from human detection systems. Their creation of multiple MechaGodzillas and the powerful upgrades they made to the cyborg Gigan is proof of their skill with robotics. The Cryog are also far ahead of humans in their prowess with genetic engineering, having apparently created an entire species of giant alien Kaiju, the Trilopods.

Very little is known about Cryog society and culture, other than that they are highly militaristic, respecting strength above all else. Emperor Karkaro seems to hold nearly absolute power over his people, who must obey his commands or die. The elite infiltrator Lieutenant Vilenna is the only female Cryog encountered thus far, suggesting females do not normally participate in military operations for whatever reason. The Cryog's belief in their own superiority is beyond arrogance: in their eyes, humans are inferior beings, worthy only of subjugation or obliteration.

The Cryog do not have any known base of operations on Earth, preferring to remain aboard their ships hidden in high Earth orbit.

Leaders
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Commander Rhizon,: The leader of the original invasion force that attempted to conquer Earth, Rhizon is a skilled military commander and a master manipulator. However, he has severe anger management issues; when he gets frustrated, he can make rash decisions that lead to crushing defeats and losses, such as the failed invasion of Earth that left him with his trademark scar. Sadistic and ruthless, Rhizon is frequently hostile to his own subordinates and unconcerned for their well-being. Although he set out to lead his people to a new home, he now sees Earth as a prize that he must personally conquer in order to cement his legacy as a legendary commander, and he is willing to sacrifice as many Cryog as necessary to do so. He sees humans as an inferior species and harbours an obsessive hatred of Godzilla, whom he blames for all his failures. Emperor Karkaro is the only being he fears, and though he plays the part of loyal servant for now, secretly he is plotting to usurp the throne.

Lieutenant Vilenna: The only female Cryog encountered thus far by the GDF, Vilenna has served at Commander Rhizon's side at least as far back as the First Cryog Incursion of 1974. Rhizon apparently recruited her personally due to her skill at infiltration; even among her fellow Cryog, Vilenna's shapeshifting ability and talent for deception is exceptional. While she respects Rhizon for recognising her skills, she resents that her fellow officers still look down on her for being female and is determined to prove herself better than them. She covers her insecurities with an ice-cold demeanour, often attempting to be the voice of reason when Rhizon's temper gets the best of him. Like all other Cryog, she sees humans as weak and inferior and enjoys taking out her frustrations on them whenever possible; her reputation for cruelty towards prisoners is infamous and extreme.

Emperor Karkaro: Emperor of the Cryog species, Karkaro held absolute power over them, but was nonetheless forced to flee with his people when King Ghidorah wiped out their home planet. He spent an unknown amount of time travelling through the depths of space, searching for a suitable world to claim, before he became aware of Rhizon's attempts to conquer Earth. Now, Karkaro has arrived with his forces to take charge of Rhizon's operations, confident that his Trilopods will overpower any resistance. Although he usually maintains an air of calm and happiness, Karkaro has a twisted, sadistic personality that makes Rhizon almost look noble by comparison. As Emperor, he expects total obedience; any refusal or disloyalty is met with immediate death.