Etna has the appearance of a relatively small and thin-bodied goth girl. She seems to like wearing all things leather such as a collar with a ring on it, with a leather crop top, a micro mini skirt, arm long gloves, thigh high boots, and skull-shaped earings.

In Disgaea 2, her outfit is slightly modified, wearing a bat-shaped bra and having a skirt with side slits, different gloves and boots, and having Prinny themed wallets on the back of her skirt.

In Disgaea D2, her attire underwent another change, now wearing shorts instead of a skirt (while retaining the Prinny themed wallets), a shorter bra, shorter gloves, and boots with red stockings underneath.

Etna's personality can be described as such, two-faced and hypocritical in a humorous way, often criticizing Laharl's plans or objectives, yet rarely offering any ideas of her own. However, she has proven that she can be quite devious when properly motivated usually through anger.

Etna, much like Laharl, has a great love of sweets, especially pudding. Though, she likes to snark at Laharl's childishness when he expresses said love. Her relationship with Laharl resembles that of a slightly older sibling, they often bicker like an old married couple, where as her relationship with Flonne is decidedly more friendly. Even then, she can't help but snark at her air headed personality and love of tokusatsu.

Like almost every demon, Etna espouses evil and cruel deeds as a laudable thing. Despite this, she is shown to have a soft side, specifically towards King Krichevskoy to whom she has sworn eternal loyalty to. The best example of this loyalty is when before Krichevskoy died, he had tasked Etna with the job of looking after his son. This is possibly the main reason why Etna serves as Laharl's vassal because of said promise.