The servants of a lawful and good celestial deities are organised into celestial courts, a hierarchy of angels each dealing with one of three spheres of their deity's mission. Each sphere then has three ranks, or orders, of angels. The highest order of each sphere has direct contact to their deity.
A celestial servitor (commonly called an angel) is a semi-sentient being constructed by their deity to fulfil their will. A celestial servitor vehemently embodies the values and ambitions of their deity, and have sufficient sentience to carry out their divine plan. They lack their own will, thoughts, and feelings, sharing those of their deity, though are imbued with the sentience to carry out their part in the cosmos. The non-apostolic soul of an angel is tied to its physical being, and as such does not grant power to its deity. The more likely an angel is to interact with mortals, the more humanoid its appearance will be.
THE DIVINE SPHERE
The first sphere is concerned with the spirit and divinity of their deity. It is their task to ensure the divine spirit flows from the deity and out into the cosmos. As the divine sphere is not intended to interact with mortals, even their lowest order holds non-humanoid forms.
Seraphim
Seraphim sing the prayers their god receives directly to them. As a vessel of the faithfuls' prayers, the seraphim gains immense powers. Their song is only understandable by their deity, all others who hear it being prone to madness. Seraphim also defend the house of their god, being extremely powerful. A mortal who sees a seraph with their naked eye and being unable to withstand, erupts in flame. Should a mortal survive an encounter with a seraph, they are never truly free, as the song of their prayer remains in their head.
Ophanim
Ophanim, or thrones, are angelic servitors that rule over the plane of their deity. They each manage a region of the plane and are lord over the servitors and souls there. An ophanim is deeply and inherently connected to their divine region. Ophanim can take on many forms but a common is that of floating interlocking rings covered in eyes revolving around a central eye or radiant mote.
Vicarim
Vicarim ensure the divine spirit and power of their deity flows from them and into the cosmos, with a special focus on holy sites and places of worship. The vicarim are not meant to interact with mortals, only to spread spirit and divinity. Therefore, they are fiery motes of energy or eyes held aloft by wings.
THE DOMAIN SPHERE
The second sphere is directed to fulfil their deity's plan in the cosmos and govern their domain. For example, the second sphere of a god of arcana will work to ensure magic flows as it should within the cosmos.
Elohim
The Elohim are angels tasked with carrying out part of a deity's domain. A god of death may have an elohim to oversee death or disease, while a god of nature and bounty may elect an elohim of farming. By creating an elohim, a deity imbues it with parts of their power. The form an elohim is given is dependent on the domain they are charged with. As they at times interact with mortals, they usually have a humanoid form with multiple sets of wings made of pure radiant energy and a blazing crown or halo on their head. They are still unsettling to the mortal mind, however, and may hold features such as being made of pure energy. The elohim are often referred to as an angel of their aspect, such as the Angel of Death and the Angel of Glory.
Virtues
Virtues hear the prayers of the faithful and recount them to the seraphim and elohim. Virtues are also tasked with keeping the order and balance of their domain and so send forth authorities to pursue this goal. Additionally, the virtues hold the power to perform minor miracles. A virtue's form is determined by their deity, but they usually have multiple faces and sets of wings.
Exarchs
Exarchs, or authorities, fight that which opposes their deity. The exarch of a light god may fight the forces of dark. Exarchs most commonly fight other exarchs in an endless war that upkeeps the balance of the cosmos. Exarchs are built for battle and so are not very humanoid in form. They usually appear as a hollow set of armour with weapons in place of hands and arms, a pair of strong wings on their back, and a blazing spirit from within the armour.
THE APOSTOLIC SPHERE
The third sphere is that which most closely interacts with mortals. It is tasked with directing mortals in accordance with the plans of the deity.
Archangels
Archangels, or archai, oversee communities and nations of humans. They may appear to or interact with select chosen individuals, such as kings or prophets. The archangels also lead the battles their deity fights through creation. Archangels appear as adults with a large set of wings, twice the length of their body, and large radiant halo above or behind their head. From their eyes radiate elements or arcane flames. Like angels, they are always beautiful in the eyes of their beholder, yet strike a more imposing figure, clad in armour.
Aasimon
Aasimon, or angels, are the most common celestials in the service of a deity. They appear mostly humanoid, as an adult with feathered wings and a halo above or behind their head. Their eyes lack irises and pupils, the sclera radiating with energy. Angels are immensely beautiful in the eyes of their beholder, their actual features may however vary based on who sees them. The task of an angel is to help specific mortals and deliver the divine messages of their god. Guardian angels are a subset of angels. Angels are also tasked with overseeing the planes on behalf of their deity.
Cherubim
Cherubim are lesser celestial spirits who wander the plane of their deity or holy sites on the material world. They embody the spirit and values of their deity and it is their mission to spread it in smaller ways. The cherubim include creatures such as pegasi and unicorns. The cherubim are an epitome of the deity's domain. A cherub of a mischevious and chaotic god may be a small weasel-like creature causing mayhem on the mortal plane.