Ramiel

"Ramiel, Prince of Hell."

- Crowley and Castiel (separately)

"I don't care. I don't care who you are. I don't care why you're here. I don't care about Heaven or Hell or anything. I don't even care that Lucifer's got a bun in the oven."

- Ramiel (to Dean)

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.

History
After creating the first demon Lilith, Lucifer created the four Princes of Hell: Azazel, Ramiel, Asmodeus and Dagon. The four acted as generals of the demonic armies before Ramiel, Asmodeus and Dagon lost interest in Lucifer's plans and retired to Earth while Azazel went on to rule Hell in order to release Lucifer and cause the Apocalypse.

After the defeat of Lucifer, the King of the Crossroads Crowley and another demon approached Ramiel to take rule of Hell as is his right as one of the Princes of Hell. However, Ramiel is uninterested and suggests that Crowley take power for himself. Ramiel requests that he and the other Princes be left alone, warning of dire consequences if he is not. Crowley agrees and gifts Ramiel the Lance of Michael and the Colt, the weapon that had killed his brother Azazel.

In 2017, under the orders of the British Men of Letters, hunter Mary Winchester leads Wally, the Seraphim Castiel and her sons Sam and Dean to steal the Colt, pretending that they are simply killing a demon active on Earth. When Ramiel arrives, he is attacked by the Winchesters with devil's trap bullets and the demon-killing knife, but Ramiel is completely unharmed by the attack and easily defeats the Winchesters. During the fight, Ramiel shocks Mary with his yellow eyes as the only yellow-eyed demon she knew of was Azazel who had murdered her. Recognizing Castiel as an angel, Ramiel is amused and stabs him with the Lance of Michael, mortally wounding him. Before Ramiel can do any more, he is hit by Mary with a jeep, knocking him out of the fight briefly, allowing Mary to escape with Castiel joined by her sons after killing two of Crowley's demons who kill Wally.

After the attack on his house, Ramiel chases after the Winchesters to get revenge. Nearing the barn they are hiding in, Ramiel is confronted by Crowley who attempts to convince the Prince of Hell to spare the Winchesters. However, Ramiel refuses to be deterred and throws Crowley through the barn door, knocking him out. Entering the barn, Ramiel is trapped in a circle of holy fire by the Winchesters, amusing him. Ramiel tells the Winchesters that he has no interest in any of the going's on in the world, not even Lucifer's child though he warns Dagon is. Ramiel demands back what was stolen from him, promising to let the Winchesters go if they will comply. Sam and Dean correctly claim to have no knowledge of what he is talking about and Ramiel starts a 30 second countdown.

After the 30 seconds are up, Ramiel uses the Lance of Michael to send out a shockwave of dirt in order to put out the holy fire and engages in combat with the Winchesters. Despite their best efforts, the Winchesters prove to be no match for the Prince of Hell and he attempts to impale Dean on the Lance. Before he can, Sam grabs the Lance and grapples for control of it at close range with Ramiel. As they struggle, Mary stabs Ramiel in the back with an angel blade, distracting him for a moment. While he's distracted, Sam snatches the Lance of Michael from Ramiel's hands and stabs him in the heart with it. As he flickers gold and his wound catches on fire, Ramiel laughs. Finally, Ramiel explodes into dust, killing him.

In The Raid, the British Men of Letters reveal their possession of the Colt when coming under attack by the Alpha Vampire. Mary then admits to Sam that she stole it from Ramiel.

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. Ramiel was momentarily stunned by being hit by a jeep, but recovered very quickly. He also took blows from the Winchesters in his fight with them and appeared to suffer no pain from it.
 * 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. He was also immune to the Enochian Brass Knuckles which are syrongstrong enough to take care high classed angels such as Seraphim.
 * 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 weakened Seraph and battle three hunters at once with ease.
 * Expert Hand-to-Hand Combatant - Due to his millennia of experience, Ramiel was an expert hand-to-hand combatant capable of fighting three experienced hunters with great ease.

Weaknesses
As a Prince of Hell and one of the most powerful demons to ever live, Ramiel possessed very few weaknesses.

Harming, Misleading and Trapping

 * Holy Fire (possibly) - As the devil's trap carved bullets didn't affected him, Sam and Dean attempted to trap him with the Holy Fire. It is unknown if he could pass through it without getting hurt by not using the Lance of Michael.
 * Demon-Killing Knife- The knife is not able to kill Ramiel though it did seem to very slightly wound him.
 * Angel Blades - Ramiel cannot be killed by an angel blade but when he was stabbed with one, it distracted him for a moment, possibly causing him pain.

Killing

 * The Colt - As the Colt could kill Azazel a fellow Prince of Hell, it could kill Ramiel.
 * Lance of Michael - He was killed by the lance.
 * The First Blade - It can kill anything.
 * Death's Scythe - It can kill anything.
 * Primordial Entities - God, Death, the Darkness, and Archangels can kill a Prince of Hell easily.

Appearances

 * Season 12
 * Stuck in the Middle (With You)
 * The Raid (mentioned only)

Lore
In reality, Ramiel (means "thunder of God" from the Hebrew elements ra'am, "Thunder" and El, "God".) is the name of a fallen Watcher angel in the Book of Enoch, rather than a demon. As described in the book, they are the leaders of 200 angels that are turned into fallen Angels, the Grigori, due to them taking wives, mating with human women, and teaching forbidden knowledge. One of the 20 leaders, Ramiel is mentioned as the sixth. While the Book of Enoch is consider apocryphal text, Ramiel does appear in the Bible proper.

Although he is classified as one of the fallen ones, he is described as the angel of hope, who is charged with delivering visions and guiding the faithful to Heaven. So it could be considered as ironic.

Trivia

 * Ramiel is the second powerful enemy to laugh after being mortally wounded by a Winchester. The first was Dick Roman when Dean killed him with the Bone of Righteous Mortal Washed in the Three Bloods of Fallen.
 * Before his death, Ramiel owned both the weapon that killed his brother and the weapon that would ultimately kill him.
 * He is the first Prince of Hell and yellow-eyed demon to appear in the present timeline since Azazel's death in Season 2.
 * Unlike Azazel however, Ramiel's name was introduced at the time of his introduction, so he was never referred to as The Yellow-Eyed Demon.