The Arch-vile has a similar design to the original Arch-vile; a tall, thin and pale humanoid body with flaming arms and hands. In the gameplay trailer, the Arch-vile is revealed in a dramatic cutscene and is likely to be featured as a mini-boss of some kind.
In Doom II the Arch-vile has the ability to resurrect slain demons and use fire to burn its enemies, it is currently unknown if these abilities will carry over into the Doom Eternal.
In Battlemode, one of Doom Eternal's multiplayer gamemodes, the Arch-Vile will be a playable demon that uses elemental abilities. This includes; fire attacks and lightning attacks.