Here are some more.
Note that on some of them we don't have an information of their REAL faction name...just generic "The Invaders". So, I've put-in those titles, specified by the line they were part of, where appropriate.
UFO (The Aliens)
Primary Colors: Gray, Light Gray
Highlight Colors: Orange, Neon Green (mechanics and windshields)
Details: Black, Red (mechanics), Blue (rare)
Style: Discs, sloped, domed, rounded, winged, predatory
Personality: Territorial, honorable, ruthless, calm, powerful, expansionist
Leader: Alpha Dragonis
Other Important Figures: Andy Droid
Other worlds: A moon
Mothership: Interstellar Starfighter
Description: A powerful interstellar empire, The Aliens (UFO) originally ruled over the Insectoids. At some point, the Insectoids led a rebellion against the cruel Alpha Dragonis for reasons unknown. When the Insectoids (then known as the Zotaxians) fled to the planet Holox, Alpha Dragonis ordered them pursued and eliminated. Unfortunately for the Aliens (UFO), the native biological dangers of the planet Holox destroyed the pursuers and drove-off their forces. After this, the Aliens pursued a plant to invade Earth, which was largely unsuccessful, although it is possible (if unlikely) that their intervention led to the catastrophe that drove the Space Police to relocate to an off-planet base.
The Insectoids/The Zotaxians
Primary Colors: Dark Gray, Blue
Highlight Colors: Green, Black
Details: Neon Blue (mechanics), Neon Green (mechanics, windshields)
Style: Insectile, segmented, curved, bulbous, articulated, delicate, sharp, spindly
Personality: Intelligent, driven, focused, unwavering, purposeful, patient, greedy
Leader: Gypsy Moth/The Queen
Other Important Figures:
Other worlds: An asteroid, Holox
Mothership: Arachnoid Star Base
Description: Originally the conquered peons of Zotax, the aliens now called the Insectoids were oppressed by the ruling forces of Alpha Dragonis and his legions. At some point, Gypsy Moth, then a charismatic rebel leader, organized a rebellion against the ruling Aliens (UFO). She and her people then fled across space to the planet Holox. There, after a long struggle and search for energy, they encountered the mysterious energy orbs to power their technologies and came to venerate the giant inhabitants of the planet, building their ships in the likeness of the insects. It is believed that after this they left for a galactic exodus, seeking new worlds and sources of energy, but consuming what they found like locusts. Eventually they, like their ruling predecessors before them, arrived at earth. This time they were repulsed by the combined forced of the Space Police and the Roboforce. Gypsy Moth led her people away into the darkness of space, and while some believe that they have returned to Holox, it is unknown where the Zotaxians—the Insectoids—will appear next.
Life on Mars (The Martians)
Primary Colors: Red, Blue, Tan, Sand Purple
Highlight Colors: Sand Purple, Black (mechanics, windshields),
Details: Neon Green (rare), Dark Gray (mechanics)
Style: Crude, mechanized, bipedal, functional, swept, jagged
Personality: Noble, intelligent, curious, calm, industrious
Other Important Figures: Cassiopeia, Vega, Mizar, Altair
Mothership: Excavation Searcher
Description: The intelligent and peaceful inhabitants of the Red Planet, Rigel and his ancestors have led the kingship of Mars for generations. A poor people, the Martians generally viewed humanity with curiosity and no ill-will. Indeed, though apprehensive, when the first human colonist arrived on Mars from the CSA and Futuron efforts, they greeted them pleasantly and helped the stranded explorers repair their ship. Unfortunately, the next time humans would visit Mars, they would find only the ruins of the once-great civilization of Rigel and his heiress, Cassiopeia. In their place was a race of conquerors bent on the destruction of humanity and the acquisition of all the energy crystals on Mars. What exactly happened to the Martians is unknown, but ruins discovered by the New Mars Colonists points to a violent if doomed final stand by Cassiopeia’s mechanized forces and the overwhelming tide of Alien Invaders (Mars Mission) invaders. There has even been talk of erecting a commemorative statue honoring the friendship and final heroism of the Martians once the Alien Invaders (Mars Mission) forces have been exterminated.
Mars Mission (The New Mars Colonists)
Primary Colors: White, Orange
Highlight Colors: Light Gray, Black
Details: Orange (windshields), Dark Gray (mechanics)
Style: Sleek, sloped, angular, vaned, tapered, militaristic
Personality: Determined, proud, inquisitive, advanced, greedy
Leader: Astro Commander
Other Important Figures: Biff, Gemma
Mothership: Hypersonic Operations Aircraft
Description: Led by their enigmatic Astro Commander, who will forever go unnamed, the New Mars Colonists originally started-out from earth full of hope and optimism. This time, they would show the Martians the glory and honor of the human race by honoring their friendship and helping the poor civilization with the vast resources of earth. Unfortunately, it was not to be. The colony ships were destroyed in-orbit by a massive and heavily-armed force of strange Alien Invaders (Mars Mission), and their military forces sent to ground. In the ensuing conflict, it was discovered that the Martians had been exterminated, and the colonization mission given-up on, the resources allocated to the military in order to fight the war against the Alien Invaders (Mars Mission). With the help of spec-ops forces led by Biff and Gemma, the New Mars Colonists eventually pushed-back the menace and were able to establish human control over the Red Planet, but it was not enough for the Astro Commander. Perhaps an ancestor of the team that had crashed on Mars so long ago, or perhaps simply a xenophobe, the Astro Commander ordered the eradication of the entirety of the Alien Invaders, declaring a state of global emergency, martial law, and the impossibility of peace with the attackers.
Mars Mission (The Alien Invaders)
Primary Colors: Black
Highlight Colors: Neon Green (mechanics), Green, Dark Gray
Details: Light Gray (mechanics)
Style: Sloped, curved, spindly, jagged, harsh, sleek, sharp, vaned
Personality: Merciless, stupid, inventive, mystical, obsessed
Leader: Alien Queen
Other Important Figures: The Commander
Mothership: The Mothership
Description: Hailing from the dark twilight beyond the stars, the Alien Invaders (Mars Mission) arrived on Mars some years after the first human explorers had left. Without warning they attacked and destroyed the Martian race and conquered the entire planet. Bent on acquiring the energy crystals buried beneath the surface of Mars, the Alien Invaders (Mars Mission) were soon challenged by the New Mars Colonists, from whom they now face extinction. It is unknown where they came from or indeed, nearly anything about their history or society. It is known they are led by a remorseless Alien Queen and that a figure they call “The Commander” leads them into battle, although it is possible the latter is simply a rank or caste of the species, as several similar beings have been sighted.
"Re-go no kaijuu wa hoshi kara yo"
"Los monstruos de los Legos de las estrellas!"
"Lego monsters from the stars!"