Dragfly is an enemy Badnik encountered in Spring Stadium Zone, the third level of Sonic 3D: Flickies' Island.
Resembling a purple/yellow robotic dragonfly, the Badnik simply hovers erraticly around a set point. It can only harm Sonic if the hedgehog walks straight into it; destroy the bot with a Spin Dash or jump to recover its organic battery power source, a blue Flicky, and make Flickies' Island a slightly less dangerous place.
The name of this Badnik is conjectural, as no official name has been given to it. The name comes from the level editor in a development build of Sonic 3D that is included as a bonus feature in Sonic 3D: Director's Cut. Jon Burton has confirmed that the name was used in the original game.