Coper

Coper is a character introduced in the Volume 8 Aincrad side story First Day. One of the original 1,000 beta testers for the VRMMORPG Sword Art Online, he becomes one of the 10,000 players trapped in said game during official release.

First Day
He meets Kirito in the woods west of Horunka Village, congratulating Kirito for leveling up. After learning that both of them need to get a Little Nepent's Ovule for a quest in Horunka Village, he proposes that the two of them work together until both of them acquire one of said item, to which Kirito accepts.

However, after Kirito manages to acquire a Little Nepent's Ovule, Coper decides to MPK Kirito by attracting a mob of Nepents to their location and using his «Hiding» skill. Kirito points out that the skill is ineffective against monsters that don't rely on sight, such as Nepents, as the mob of enemies assault them both. Overwhelmed by a dozen Nepents, Coper manages to slay five of them before meeting his end.