Etna

"Well...I'm free. I melted and burned just about everything around me, and it's been 400 years and counting...Eh, five more minutes. I need to sit down."

- Etna choosing to remain lazy and unproductive after being freed at last Etna (エトナ, Etona) is a Demon and one of the Thirteen Calamities, being sealed within the ice-cold country of Iceberg. He is a powerful Fire Demon, hailed as the Crimson Hell Demon (紅獄悪魔, Kōgoku Akuma), as well as Hellkaizer (ヘルカイザー, Herukaizā), a title that signifies him as the strongest Demon of his element from his era. Due to being sealed inside of Iceberg, the third largest country of the bunch, he is commonly believed to be the overall third strongest of the Thirteen Calamities, despite being more than capable of taking on the likes of Arma, albeit with difficulty.

Trivia

 * Etna is named after "Mount Etna" a volcano, which in Greek mythology is believed to have Typhon, the Father of all Monsters, trapped beneath it.