Arc

Arc is the protagonist of Skeleton Knight in Another World (original title: Gaikotsu Kishi-sama, Tadaima Isekai e Odekake-chū), an isekai fantasy anime.

He's a Japanese gamer who falls asleep while playing an online MMO and wakes up transported to that game's world—trapped in the body of his overpowered avatar. The catch: his character uses a special "Skeleton" skin, so beneath his imposing silver armor, he's literally a walking skeleton (though not undead—he still eats, drinks, and functions normally).

To avoid scaring people with his bony appearance, Arc keeps his helmet on at all times and adopts the alias "Arc" while posing as a mysterious knight. He aims for a low-key life as a mercenary/adventurer, but his strong sense of justice keeps pulling him into action—saving people from bandits, slavers, and other threats, often with overwhelming strength and game-like abilities.

The story follows his adventures in this fantasy world, where he unintentionally becomes a force for good while trying (and often failing) to stay under the radar. It's a classic overpowered isekai with action, comedy, and some ecchi elements, centered on Arc's laid-back personality clashing with the heroic situations he ends up in.