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A loli-devil from the game series Disgaea on the PS2, she appears in both the original as well as the sequel. She is often accompanied by Laharl (a child overlord of a netherworld) and Flonne (the loli-angel of the series) Has red eyes, red hair, and a demon tail.
She is most often depicted wielding a spear (it was the weapon she was best with in game), but due to the nature of the game she was in, pictures of her using other weapons may be found as well.
Etna plays a starring role in one of the modes included in Disgaea: Afternoon of Darkness for the PSP.