Angels

Classes:
Cherubs:
These are often called Cupids, and are the third class types of angels. They are often the lowest rung of the angel hierarchy and follow heaven's orders, especially for manipulating affections and bringing people together for special bloodlines on Heaven's orders.

Grigori:
Elite squad of angels sent to watch ovver and protect humanity. However, they they turned evil and many were wiped out. Those that have survived prey on humanity. They kidnap them and trap them in dream states of their perfect Heaven so the Grigori can feed off their souls. Whereas most angels have angel blades/knives, this group had angel swords and their names were written on them. They are stronger than the seraphim.

Rit Zien:
These are essentially the medics of heaven. They heal angels who have been injured, especially in the battlefields against Lucifer and demons. If the injury could not be healed it was their job to give them a quick and painless death, placing their hand over the face of the angel and shining a pink light from their palm which causes the target/victim to quickly and painlessly implode into a pink liquid of their essence.

Angels:
These are the common angel. They are not as powerful as seraphim or archangels, but are powerful enough. They can often use telekinesis, teleportation, have above-demon level of strength (normally just above the black eyed demons), and can smite. They carry angel blades that can usually kill any of the lower demons, monsters, or even themselves.

Seraphim:
Stronger than Angels but weaker than arch angels and grigori, this group is actually quite powerful. They are often superiors to Angels and lower rungs in the hierarchy and have the ability to smite most monsters. They can use biokinesis and the holy white light. Usually they are the go between for Angels and Archangels.

Archangels:
This one is going to be limited to Canons for sure. There are only four of them. Michael, Raphael, Gabriel, and Lucifer (who is now a fallen angel). They are the only 4 angels to ever have actually met god personally (although Metatron has alluded to having seen god). They are the oldest and most powerful of the angels. Gabriel hid out and pretended to be a trickster but is in fact an archangel.

Reapers:
These angels specifically serve Death. They attempt to keep the natural order of things and while they are technically angels, they are completely neutral in alignment. They wil often appear at great disasters in mass gatherings. In the veil they can manifest and take human form, but only other angels can normally see them.

The Fallen: The angels lose their wings as they fall to Earth, and are no longer able to teleport. They do retain varying degrees of angelic power.

Universes: Supernatural

Special Abilities:
For the most part they are all powerful and just about immortal. They can blow out eyes with their true form if they are seen or destroy buildings if they speak in their true form. They can 'possess' humans, but only if they are willing. I have outlined differences in their abilities between classes above.

Origin: Created by God to serve him.

How Do You Become one:
You can't become one you are born one. Though you can allow one to inhabit your body.

Weaknesses:
For the most part angel blades are the only things that can kill an angel. Holy oil and spells can trap them, keep them out, or keep them from finding people. More powerful angels can kill less powerful angels by smiting, and high level demons can kill low level angels.

Strengths: Basically immortal, their blades can often kill just about anything (aside from those more powerful like high-level demons or high-level angels when a lower powered angel tries to kill them.)

Food Source: Do not require food, though they can eat.

Forms: Angelic Form (which can not be seen by most humans or supernatural creatures because it could blind them), and host form (inhabiting a willing human).