Most of the time, Virasians appear under human disguises to blend into society. However, they can be told apart from other humans by the fact that their eyes glow a faint yellow when they are in darker areas, as this benefits their eyesight. When their disguises are lost, all Virasians resemble smaller versions of their vanguard Kaiju, Viras.
The Virasians first appear aboard their spaceship, which is approaching Earth, being heard but not seen. Gamera attacks the spaceship and sets it on fire. Before the ship explodes, the Virasians manage to send a distress signal to their home planet, and more Virasians travel to Earth. All but one change into human disguises, and later take two Japanese boy scouts hostage after learning of Gamera's love for children. This allows them to take control of Gamera through the use of their mind control device. After Gamera breaks free of the Mind Control and incapacitates their UFO, the Lead Virasian commands his comrades to shed their human disguises, decides to fuse himself with the others, into their collective form, Viras. Ultimately, all of the Virasians die as Viras after Gamera freezes him in the upper atmosphere, but it is possible that more were plotting to invade in the future.
- The Virasians are one example of an alien race whose individuals could be considered kaiju in their own right; another example of this are the Millennians.
- Because the Virasians who merged into Viras were only part of a small expedition force to Earth, it is highly likely that more of them exist on their home planet.
- Like the Terrans, who are named after their home planet, Terra, it is possible that the Virasians' home planet is named after them.
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