All at once. Massive invasion, no warning.
 Slowly, beginning with small exploration vessels and building up.
 Subversive. World leaders mind controlled or replaced, military deescalated before arrival.
 Eclectic. Aliens prepped invasion by seeding planet with small bits of their life or culture.
 Formally. Alien vessels came with ambassadors, gave casus belli.
 Great catastrophe. City destroyed, massive natural disaster, etc. Invasion coming soon.
How did the aliens know about us? - 1d6
 SETI radio signals. Led them right to us.
 They came before, and their first ambassadors were slaughtered. Ancient aliens.
 Life on Earth is from a comet that came from a planet they genocided. Came to finish the job.
 They seeded Earth with life, or uplifted the human species for this exact purpose.
 They just kind of stumbled onto us; warfleet was busy doing something else.
 Correctly guessing our planet had intelligent life based on the sun and time span.
Aliens look like? (Leader Caste) - 1d12
 Lovecraftian. Weird bulbous fleshy shapes, tentacles, totally inhuman.
 Little Green Men. 50% chance to actually be robotic bodies for the fungus-like species within.
 Huge buff reptilian bipeds. They look like the type of species that invades everyone.
 Insectoids. Different evolved castes to perform specialized roles.
 Huge birds. Talons are very flexible; but have traditional wings.
 Robotic species. Walkers and drones have a roughly tripod shape, hinting at biological origins.
 Kangaroo looking things. Head is obviously artificial- enlarged to support large brain.
 Abstract. Made up of swirling mists, colors, shapes, made of light, bubbles, etc.
 Jellyfish like creatures that float. Grow membranes on invaded surfaces, stunning stingers.
 Tall humanoid shapes; solid colors with glowing eyes and no detail. Naked, don't seem to carry tools or move very fast but somehow still terrifying.
 Aquatic muscle-like species. Somehow have advanced technology, individuals “grow” in clusters that make up the base unit of their society.
 Look like popculture demons. Red skin, horns, spade tails. Probably have a bunch of pentagrams on their technology too. Religious panic. Aliens designed this look a few generations ago for the invasion, so they're a little out of date to strike true fear into most people.
Aliens technological basis? - 1d10
 Total biotech. Everything is a living tissue, specialized for their space-fairing roles.
 Machine-Biology. Machines that act as organisms. Practical applied concepts.
 Clunky. Large plastic and metal boxes, heavy keyboards and levers. Gaudy colors.
 Sleek. Touchscreens, holograms, smooth surfaces. Very clean.
 Aura. Glowing areas and waves of light, interacted by touch or psychic controls.
 Crystal. Crystals in ports, computers are crystal chips arranged in rows.
 Direct brain control. Aliens have sockets in their heads to plug in to control ships.
 Anachronistic. Medieval or early industrial revolution looking technology. Makes up for it in advanced materials and pragmatism. Didn't develop new designs, just kept making originals better.
 Brutalist architecture combined with touch and glowing displays and AI that lives on the “surfaces” that the aliens control. Insignias and buttons engraved on it.
 Advanced modular tech. Rooms and items appear as solid gray blocks or pits filled with texture-less beads, but form into advanced structures on command, sliding out parts and reforming.
Alien Signature Weapon? - 1d6
 Heat ray. Burns through anything. Laser beam.
 Deadly nanites. Swarms of bots that enter targets and cause total organ failure and death.
 Death south. Horrible high or low pitched noise. Kills you if you hear it too long.
 Killing Gas. Released from on high, targets only a few species. Colorful.
 Kinetic weapons- rods from god. These aliens are boring.
 Forcefields. Bounce your bullets back, or just cut you in half with invisible force.
 Bare hands. Aliens like to kill us with natural weapons and fight face to face. Either very stupid, or absolutely terrifying killing machines. We need power armor to fight them.
 Mutated earth life. Animals, plants, and fungus. They like to create killing machines that also destroy Earth's own ecosystems- Invasive species designed to kill mankind.
Optional weird alien quirk? - 1d8
 Constant vocalization. Little clicks, hisses, electronic humming sound, etc.
 Arrange things by color. Dead humans arranged by color of clothes, buttons are color coded, etc.
 Rather gentle with most Earth life besides humans. Dogs are just stunned, humans vaporized.
 Bud constantly. Live young are expected to fend for themselves. Don't care if humans kill them.
 Give off thunderous alien war-cry after achieving a goal. Almost sing-song.
 Plaster everything in art. Insignias, flags, clan tattoos, whatever they are they are over everything.
 Have small, cute fluffy pets. Don't seem to interface with technology or sniff out humans- just companion animals. If one of them gets killed the aliens go apeshit.
 Once every day at the same time, all activity ceases and they return to ship at a specific sound or signal. Alien mass or communal feeding time.
How do they Oppress humans? - 1d6
 Traditional slave drivers. Prisons, ball and chain, hard labor, plasma whips, etc.
 Horrific executions for captured soldiers, torture for fun, cruel experiments.
 Mind control devices, pheromones, implants, etc.
 Children are teleported away, out of their parents arms. Don't know if killed or brainwashed.
 Eugenic programs and forced modifications. Tracking chips, ear tags, humans are experiments. People can roam but any weapon or fortress being built is just blasted down.
 Dystopia. Control people through bureaucracy. Calm rebellions through bread and circuses. Give false gifts of virtual-reality entertainment to keep people sedated and ignorant.
Why are they invading us? - 1d8
 It's a planet that can sustain life. That's value in and of itself. Humans unimportant.
 Might makes right. Subjugate and destroy all threats before they can threaten us.
 We have a common ancestor. Humans were the favorite. This is revenge.
 Total nonsensical. Their logic and reasoning is beyond anything we can understand.
 Integration. Want our DNA, or forcibly “advance” humans to join intergalactic community.
 Accident. We look like their demons, human probe acted aggressively or accidentally rammed a colony and killed one of their own, our radio signals sound like threats to them, etc.
 Sex. Humans to become alien sex slaves, male and female. Possibly many earth animals too. Gross, but you'll be too drugged up and controlled to have a say.
 Food. Humans taste good to aliens, babies are a delicacy- Farmed and sold to intergalactic markets. Could be cooked, drained of fluids, eaten whole, etc. Aliens may keep it a secret.
What is Humanity's last hope? - 1d10
 There isn't one.
 The Underground resistance movement after the aliens occupy our planet.
 Gifted human, destined to be a hero. May have special powers, or may just be really lucky.
 Another, benevolent, group of aliens. Feed information, may grant technology to fight back.
 Secret vault of ancient technology. Atlantis rises.
 The world supply of nuclear weapons. Blow them to hell.
 Empathy. Aliens never experienced it, seem bewildered by kindness. Could be shown love.
 Hidden bunkers and vaults, aliens can't find it through lead. Wait until this blows over.
 Secret multinational organization. Best and brightest. X-Com.
 Mother Nature. Storms pick up, animals attack alien invaders, lighting shoots upwards. Could be coincidental or something overtly supernatural is going on. Planetary consciousness?