| This minifigure has only appeared in video game(s)|
Although this article is about an official minifigure, it never existed in physical form, or appeared in any official LEGO sets.
The Unidasu is a recurring enemy in the Sonic the Hedgehog series which first appeared in Sonic the Hedgehog (1991). It is a Badnik variant and an Orbinaut model created by Dr. Eggman which fires spiked balls at enemies.
As part of the Sea Urchin-like Orbinaut series, Unidasus resemble its other variations such as Uni Uni. They have a spherical body with wide eyes and four red spiked balls orbiting their body. Usually, their body is blue when in their neutral state, but when spotting an enemy, their body turns red. They also usually have black eyes, but had cyan eyes in Sonic Lost World.
In Sonic Adventure and Sonic Adventure 2, the Unidasus' bodies were colored black with cyan eyes. They were also given a grey bottom plate and small motors on their back. Orbiting them are four black, explosive orbs with white spikes on them.