Castiel

Angelic Possession - As a spiritual being, like all angels, Castiel needs to use and possess a human vessel to physically interact while on Earth. As an angel, he requires the vessel's permission.
Enhanced Astral Projection - As a Seraph, Castiel's true visage is now far more hazardous and far more terrifying to creatures such as humans, demons, and other earthly monsters. While projecting his true form from his vessel, his irises gained a deep and bright blue glow, his body emitted a powerful pinkish-white light and the shadows of his wings appeared on his back. Even in a weakened state, he was able to intimidate Crowley into retreat, despite the demon's position as the current King of Hell.
Advanced Chronokinesis - As a Seraph, Castiel can not only travel through time, but can now send people back through time and bring them back without having to physically be there with them. However, the further back he sends someone, the harder it is to retrieve them. This was evidenced by the time he sent Sam and Dean to the 1800's, he could only send them for 24 hours or else he would be unable to bring them back and they would be lost to them.
Dream Walking - Castiel appeared in Dean's dream to deliver him a message.
Eidetic Memory - Castiel has the face and name of every prophet etched into his memory.
Advanced Healing - Castiel has displayed the ability to not only heal any wound, but can also cure people of infections that will turn them into monsters as shown when he cured Dean of his transformation into a Jefferson Starship. Castiel also believed he could heal Kevin Tran of a cut-off finger which is later shown to be true. On one occasion while healing a gunshot wound his hand glowed though he usually heals without any visible sign besides the injury healing. However, there are some things even he can't heal. According to Castiel, Sam is damaged on the subatomic level from his trials and it is beyond his power to fix that. However, after Gadreel heals most of the damage done to Sam, Castiel was able to finish the job over time in stages.
Immortality - Castiel, as an angel, like all celestial beings, doesn't age over time and is immune to disease. He never tires, and does not need to eat, sleep, drink, or breathe to sustain himself or even his vessel.
Invisibility - Castiel can become invisible to humans. He used this ability to spy on Dean living a normal life and again when trying to see how much Dean, Sam, and Bobby have learned about his and alliance with Crowley.
Invulnerability - As an angel, there are very few things able to kill Castiel as he has shown to be impervious to most forms of harm. He possesses accelerated healing abilities that allow him to heal wounds that would kill a human in seconds, if not instantly. He is unharmed by extreme temperatures. In "Lazarus Rising", he absorbed several shotgun blasts directly to the chest. He even withstood the full force of the Demon-Killing Knife and simply pulled it out of his shoulder before dropping it to the ground. He is immune to all ailments and is immortal, able to fully heal from any non-supernatural wound regardless of its fatality.
Reality Warping - Cas, in one instance, altered reality, by shaking a 'Sorry' board-game, and having everything instantly set up. He was later able to fill a vial with his blood just holding it tight in his hand and not making any cuts. His highest capability in this area was when he was able to change his appearance and clothes into his original one after returning from Purgatory.
Vessel Locking - Castiel has displayed the ability to grab a demon's smoke form and force it back into its body to smite it.
Proficient Torturer - Castiel was shown to be skilled at the art of torture, as seen when he tortured one of Eve's Jefferson Starships into giving him information in a matter of minutes, despite having his powers blocked by the mother of all and on another occasion, when he tortured Dr. Visyak (who had previously resisted Crowley's attempts at the same) into giving him the spell to open Purgatory.
Soul Reading/Channeling - By pushing his hand into a person's chest, Castiel can determine the presence and condition of a person's soul, and if the soul was branded by a deal. He can also siphon energy from or completely absorb a soul to recharge and enhance his powers. The process is extremely painful and delicate, having been noted by Castiel as putting one's hand into a nuclear reactor and causing the person to explode should anything go wrong. Castiel displayed this ability to see that a boy had sold his soul to Balthazar and again to see how damaged Sam's soul was after it had been tortured in Lucifer's Cage. He used it to search Sam's body and later informed Dean that Sam's soul wasn't there, presumably because it was still in Hell. Castiel displayed this ability to strengthen himself with 50,000 souls from Hell and again when he absorbed all the 30-40 million souls of Purgatory to evolve into a god.
Leviathan Perception/Sensing - Due to having been used as a vessel for the Leviathans, Castiel can see past their vessels and shape-shifting abilities and correctly identify them. This ability allowed him to identify the real Dick Roman, so he and Dean could kill him. While in Purgatory, Castiel was able to sense the presence of two nearby Leviathans before they could attack the group while Dean and Benny were completely unaware of them and later sensed two more approaching as he and Dean neared the escape portal.
Advanced Smiting - Castiel's angelic killing touch became much more powerful after his resurrection. He could instantly kill several demons with great ease by using this ability. He was also capable of killing various monsters using this ability such as Lenore, or other creatures even in Purgatory. He tried to smite a Leviathan in Purgatory, but he was in able to. However, more powerful beings such as the archangel Raphael, however, were immune to this power and could also extend this protection to lesser beings such as demons. It is revealed that this power burns out the eyes of the being it is used on and liquifies all of their organs.
Induced Sedation - Castiel can cause instant unconsciousness in humans by tapping them or simply placing two fingers on their forehead.
Mental Manipulation - By placing his hand on a person's forehead, Castiel is able to manipulate a person's mind, being able to create, erase or alter memories or simply alter their perception of events altogether. He easily tore down the mental dam inserted by Death on Sam that protected him from the memories of him being tortured in Lucifer's Cage. Though he was unable to cure Sam from the resulting madness it caused, he was able to transfer the mental damage from Sam to himself. He is also able to show a person the true version of their memories, not just the version they choose to remember. This is shown when he makes Dean see what really happened when he escaped Purgatory. He is also able to enter other people's minds and take someone with him as he entered Fred Jones' mind with Sam. However, this requires him to maintain physical contact with both parties. Also he could perform a process to remove Fred's powers, due to them being mentally based, presumably by causing damage to specific parts of his mind, as he ended in a completely catatonic, unresponsive state at the end of the process.
Advanced Pyrokinesis - Castiel (as a Seraph) can now no longer just create fire, but he can manipulate and extinguish it effectively. Castiel displayed this ability when he extinguished the circle of holy fire that trapped Balthazar.
Enhanced Superhuman Strength - Being a Seraph, Castiel has exhibited higher levels of physical strength than he did as a common angel. He was capable of overpowering humans, spirits, monsters, demons and even his angelic brethren with greater ease as seen against Raphael's soldiers or against his former friend Rachel. He also once forced the demon Crowley against a wall, despite the latter's position as the king of hell, and left an impression on the wall. In addition, he once again beat Dean to a bloody pulp. However, against the Archangels, such as seen with Raphael, Castiel was inferior against them. Though he could still be outmatched and killed by the Leviathans, Castiel proved capable of standing up against them. In Purgatory managed to briefly hold off two Leviathans, and ultimately incapacitate them with Dean's help. Castiel also proved to be strong enough to lift a 1 ton anvil with ease and without effort and was also able to rupture a stone wall just by merely touching it.
Expert Swordsman - While not as physically strong as some of his angelic brethren, Castiel is highly skilled in swordplay with angelic blades, having defeated several angels at least as powerful as him on many occasions, despite being outnumbered. Even when he began losing his powers after becoming a fallen angel, this remained unchanged.
Supernatural Perception/Senses - Castiel can see things hidden to humans. He is capable of immediately discovering a person's identity or their prior medical status by simply smelling their remains, regardless of the condition of said remains. He is also capable of speaking to and understanding animals, and even listening in on radio frequencies.
Telekinesis - Castiel has the ability to move objects and even people with his mind, imparting kinetic energy on matter with his mind. He used this to twist Ruby's Knife into Alastair's wound after having stabbed him it. He later uses this power to unscrew a bolt from a distance. He is also shown to be refined with this power to the point where he could inscribe enochian sigils on the ribs of the Winchester brothers' without breaking the skin.
Telepathy - Castiel is able to read the minds of humans and other lower-level angels. He can also enter and communicate with humans in their dreams using telepathy as shown with Dean.
Teleportation - Castiel possesses the ability to transport himself and others to any location as long as the area is not protected by enochian sigils, traveling from one place to another instantly. Like with all angels, whenever he uses this power, this is accompanied with the sound of wings flapping and a sudden rush of air can be heard. But he can Teleport without hearing sound of flapping wings or a rush of air. He can take humans with him, though Dean says when Castiel teleports him somewhere he isn't able to poop for a week.
Voice Mimicry - Castiel once perfectly imitated Bobby Singer's voice.
Protective Charm - Castiel is able to protect someone from harm beforehand, as seen when he prevented his vessel, Jimmy Novak from burning his hand on a pot of boiling water when asked for a sign of faith.
Apporting - Castiel is able to teleport Dean to St. Mary's Convent from Chuck's house with a touch of his hand to his forehead, and later teleports him away from Zachariah to his side at a roadside.
Spell Casting - As an angel, Castiel has extensive knowledge of Enochian symbols and spells which he has used for a variety of effects. He could draw an Enochian Devil's Trap that could completely suppress and bound a demon as powerful as Alastair. He also knew of symbols that could banish or ward off angels. After his first resurrection, he branded Sam and Dean with a pattern of symbols that would conceal them from every angel in creation, even one as powerful as Lucifer. He later did the same to Adam.
Skilled Fighter - Castiel has also shown himself to be a skilled unarmed fighter, capable of temporarily holding off the white eyed demon Alastair, as well as fighting and holding his own against Uriel. This skill remained with him as he became a fallen angel, as he brutally attacked Dean. Later as a Seraph, Castiel held off two Leviathans with only his fists

Angel/Archangel Blades
Holy Oil
Holy Fire
Archangel's Holy White light