Standing 40cm tall, they can only say "Gagu-Gagu." Humans cannot understand them; they only communicate among themselves. They live on Planet Guga-Guga and will continue to appear as long as the planet exists. Earth's missiles are blocked by their barriers, and they also use barriers to deflect incoming fire. They use ray guns as weapons. Their weakness is that the barrier must be pierced with melee weapons.

On Earth, they used AK-47s, but they have switched to plasma guns for their space expansion. Their numbers have increased significantly, and they remain mass-produced units. They are difficult to deal with because they move in swarms. Wearing alien armor, they are impervious to Earth's conventional weapons (including missiles and tanks) and only take damage from energy spheres.

A mass-produced unit that can control two modes: firing energy beams in four cardinal directions or firing beams in three forward directions. The UFO moves at Mach 30, but zigzagging is difficult; it can only move in the straight line the pilot is facing. It can move left or right, but doing so prevents it from attacking and slows its speed to 1,000 km/h. However, the destructive power of its energy beams cannot be ignored. The weakness is to surround it from both sides or use a super-large EMP laser to hit the UFO's engine—an alien crystal—for 2 seconds to disable it, then destroy it with a high-impact weapon. Like the others, it is immune to Earth's weapons and only takes damage from energy-infused attacks.

These can be produced continuously as long as Planet Guga-Guga exists. They are automatically manufactured and repaired by the planet's unique ability rather than manually. They move at 400 km/h and possess enough power to level the 63 Building in just two hits. They fire energy spheres in two modes: a slow-firing mode where the power doubles every 30 seconds (quadrupling in 1 minute), or a rapid-fire mode (0.01s intervals) where the impact is harmless to humans but carries an EMP function that causes mechanical weapons to error and explode.

There is only one. If this planet is destroyed, the Alien Guga-Gugas and Tank Pilots will perish instantly. The planet itself is a living entity. It can teleport exactly once, but the Alien Guga-Gugas and Tank Pilots, who cannot withstand Mach 1000, will suffer extreme damage, and the planet's automatic production/repair time will increase from 30 seconds to 1 hour. The weakness is the "Space Machine," a suicide device created by the combined efforts of the world's nations. If the activation conditions are met, it can set the distance between planets to zero to cause a collision, or set the distance between Planet Guga-Guga and a black hole to zero so the black hole swallows it.

There is only one, and it is absolutely indestructible. It assigns 10 missions, but the probability of the final quest appearing is 1 in 10 quadrillion (tasks are assigned randomly). If one overcomes these odds and activates the machine, it can set the distance between planets to zero to cause a collision. It is the trump card to destroy Planet Guga-Guga. However, if it malfunctions or takes even slight damage during activation, it will destroy the entire universe.