Diavel

Diabel (ディアベル) was one of the 10,000 players of «Sword Art Online». He appears in Aria in the Starless Night side story.

Chronology
He called himself a knight, had a bronze armor on chest, shoulders, arms and shins, with a large longsword on his left waist, and a kite shield on his back. Diabel was also a beta tester for SAO and knew Kirito from the beta. He tried to do everything to stop Kirito from getting the Last Attack on the boss monster of the first floor by relegating Kirito to the sidelines fighting «Ruin Kobold Sentinels». He was later struck by «Illfang the Kobold Lord» after he tried to LA it. He asked Kirito to defeat the boss monster before dying.