Ramiel

Ramiel was a Prince of Hell, one of the first demons created by Lucifer after Lilith and a demonic general before he left for life on Earth.

Powers and Abilities
As a Prince of Hell, Ramiel was one of the most powerful demons to ever live.
 * Demonic Possession - As a demon, Ramiel required a vessel to walk the Earth.
 * Immortality - As one of the first demons to ever be created, Ramiel was several millennia old when he was killed.
 * Invulnerability - As a Prince of Hell, Ramiel was even more invulnerable than a normal demon. Bullets, even carved with a devil's trap didn't even cause him to flinch. Similarly, the demon-killing knife and an angel blade caused him no real harm either.
 * Immunity - As a Prince of Hell, Ramiel was immune to most demonic weaknesses including the demon-killing knife and angel blades. While he was briefly contained by holy fire, he seemed more amused by it than anything and broke free easily.
 * Super Strength - As a Prince of Hell, Ramiel was one of the strongest demons to ever live. He was able to easily throw around Crowley, a powerful demon himself, effortlessly defeat Castiel, a powerful Seraphim and battle three hunters with ease.

Weaknesses
As a Prince of Hell and one of the most powerful demons to ever live, Ramiel possessed very few weaknesses.
 * Holy Fire (possibly) - Briefly contained Ramiel, but he appeared more amused than threatened and broke free easily, indicating it may not have had any effect and he simply didn't try to break free until he wished to.
 * The Colt - As the Colt could kill Azazel a fellow Prince of Hell, it could kill Ramiel.
 * Lance of Michael - Was able to kill Ramiel.
 * The First Blade - Can kill anything.
 * Death's Scythe - Can kill anything.

Appearances

 * Season 12
 * Stuck in the Middle (With You)