The Impostor uses the pizzicato from the 'Dead Body Reported' sound as its voice.They also have a sharp tongue (shown in their up pose) which is used in the Among Us kill animations to stab a crewmate. In all of their poses, they are shown to have a mouth filled with sharp teeth in the middle of their body. In the mod, they hold their mic in their left hand, and wields a gun in their right which changes into a knife in their up pose (both of which reference kill animations in Among Us). Red Impostor is a red bean-shaped astronaut with floating hands.
They are shown to be the less intelligent one of the couple. They are the original opponent in V1 and V2, and the first opponent of V3.