Class

A class is a role assigned to a player. It dictates their role in the game and their powers. It is one part of the player titles, the other being the Aspect.

There are 12 known Classes. Classes describe mechanics and intended roles, "channeling" the Aspect into possible action and powers. They come in active(-)/passive(+) pairs, with the active employing or affecting his aspect directly and for his own gain, and the passive being affected by his aspect, and sharing his actions with the team.

UranianUmbra HS 6414 (gives examples) of this dichotomy with the Rogue/Thief pairing (Thieves steal to benefit themselves, Rogues are Robin Hoods), and the Bard/Prince pairing (Princes destroy their aspect or use it to destroy things, Bards allow the aspect to be destroyed, or bring destruction through the aspect).

UU also explains that some of the classes tend to be assigned to males or females, some going as far as being exclusive to a certain gender.

A few class mechanics were explicitly explained, others implied:

Seer


The Seer is a support and coordinator class. According to Aradia, they understand their aspect comprehensively, which makes them quite prescient in respect to their aspect (i.e., Terezi knows all consequences of individual actions, Rose knows the "most fortuitous path", and what happens in it). It could be surmised that the Seer class is defined as "one who benefits others with their knowledge pertaining to their aspect". also states that Seers will keep their party from making grave mistakes, as if they had a strategy guide for Sburb imprinted deep in their mind.Given these descriptions one could also surmise that the Seer is a passive (+) class.

Knight


Aradia HS 6254 (said) that Knights are warriors that exploit their aspect as a weapon.

Dave has so far saved the lives of every single member of his team, such as resetting the timeline to save John and Jade, and rescuing Rose from the Draconian Dignitary near the end of act five. Karkat is less successful in the role despite his best efforts. He does, however, manage to defuse the HS 005985 (Rare and Highly Dangerous 5x Showdown Combo), which would have doubtlessly killed one or more of his surviving friends. From this and the traditional definition of the role of a knight one could speculate that the Knight serves as a protector for other players in the session. Given these speculations, one could surmise that the definition of the Knight class is "one who manipulates their aspect as a weapon in order to protect others". It is unclear where that leaves them on the active/passive axis, although it may indicate that the Knight is a passive class. The fact that the Heir class is most likely to be an active class, further supports the speculation of Knight being a passive class.

The Knight may also have something to do with breeding the Genesis Frog, since in both sessions so far, the Knight has assisted the Hero of Space in the breeding.

The Knight seems to be a class usually or exclusively assigned to male players.

Rogue/Thief


This pair of passive/active classes deal with stealing, and turning the others' powers against them. While the active Thief will steal things to their own benefit, the passive Rogue will enhance their teammates, or their session with the stolen aspect.

Vriska, as the Thief of Light, is able to steal luck from her allies or enemies, and make herself luckier. Roxy, as the Rogue of Void, is said to black-out her entire session in the future, presumably via sharing the black-out with her teammates.

The idea of the black-out may or may not have anything to do with Rose going Grimdark.

These classes are often assigned to female players, but not exclusively.

Bard/Prince


These classes deal with destruction. The Prince, as the active, is literally simplified to "destroyer of [aspect]" or "one who destroys via [aspect]". Bards are somewhat stranger, in that they "allow destruction of [aspect]" or "invite destruction through [aspect]". The Bard is also quite the wildcard; unpredictable by nature and thus equally likely to help or hinder his party, often to great effect. In extreme cases they are either single-handedly responsible for their party's massive downfall, their improbable victory, or sometimes even both.

Eridan, as the Prince of Hope, killed a lot of his teammates and destroyed the Matriorb, the trolls' hope of survival of their race. Gamzee, as the Bard of Rage, could enter some sort of berserk mode, causing deep fear in everyone around, and becoming exceptionally strong. Later on he allows his Rage to be destroyed by Karkat.He has been seen in God Tier clothing while in possession of Aradia's music box time machines, maybe, like the jokerkind strife specibus can use other weapons, Bards can use powers of other aspects in addition to their own.

Bards and Princes are exclusively assigned to male players. It should be noted that, in a somewhat related circumstance, the God Tier outfit of the Bard class comes standard with a MASSIVE codpiece, which is a highly likely reference to "Bard Quest", one of Hussie's previous adventures.

Sylph
The Sylph is a healer class. As a Sylph of Light, Aranea healed primarily by helping people to see things, both figuratively and literally. In the figurative sense, she focused on helping people to heal from psychological wounds. In the literal sense, she offers to restore Terezi's eyesight for her.

=Speculation=

Witch


Based on the actions of Jade (the Witch of Space) and Feferi (the Witch of Life), the definition of the Witch class seems to be "one who manipulates her aspect to the benefit of others". One could surmise that the Witch aspect is passive (+). Two facts to support this theory is that Jade shrunk the planets to escape the Scratch (therefore benefiting everyone inside them), while a doomed alternate timeline Feferi healed WV through a dream bubble.

Witches are speculated to be a female exclusive class.

Maid


Based on the actions of Aradia (the Maid of Time) and Jane (the Maid of Life), one could surmise that the Maid class is defined as "countering/defending against an enemy's attack(s)". Aradia was able to freeze Jack, while Jane was able to heal herself after being stabbed. It is still unknown if Maid is a passive or active class. While the facts above point to active, it should be noted that Aradia was responsible for helping the other trolls defeat the Black King with her time travel abilities, and Jane stayed alive to help her teammates.

Maids are speculated to be a female exclusive class.

Mage
Based on the actions of Sollux (the Mage of Doom) one can surmise that the Mage class may be related to the Seer class, as it also has something to do with a "deep understanding of the aspect". It may also mean "benefits himself/herself with knowledge pertaining to their aspect", though it should be noted that Sollux had concrete visions instead of just knowledge like Rose. Mage can also be synonymous to "given protection from their aspect's ill effects", assuming that Doom has something to do with calamity and death (Sollux had multiple dream selves and being able to exit the dream bubble).

Heir


The exact powers of an Heir are unknown. John (the Heir of Breath), however, displays control over the Breeze. Based on the powers of John and Equius (the Heir of Void), a Heir may be "one under the protection of their aspect", or "one who protects themself by using their aspect".

John was saved by the Breeze twice before he learned how to willingly use it, and Jack Noir was unable to pick up the source of his scent, as if the Breeze was protecting him. Equius (as well as his ancestor) was given the ability to not be noticed, which can be seen as an effective form of protection. Equius used his fists as his main weapon, which can be interpreted as him using nothing - Void - to fight and defend himself with.

Heirs are speculated to be a male exclusive class, and to be the 'Active' equivalent to Knights.

Page
The powers of the Page class are currently unknown. The Page of Breath, Tavros, was shown exhaling with breath that resembled the Breath symbol when preparing to wake Vriska with a kiss. How this may tie into his class is unknown, although it could mean that a Page is "one who provides others with [aspect]". Also supporting this theory is that when dream Jake died, the Prospitians said that "[their] hope is lost" due to him being unable to provide them with hope. Can be speculated as the male equivalent of a Maid. Dirk (albeit the splintered version of Dirk that exists only within Jake's subconscious) HS 6775 (reveals) that Pages have a lot of untapped potential and once they find this potential within them they are adept at using it. A Page of Hope is particularly dangerous in this regard, as the imaginary Dirk fears Jake's status as one.