It should be basic. I just give you the worldview and the application, but its kind hard, so I’ll give you some more pointers. This might actually also help you find other people’s Classpects.
First of all, how to tell if someone has one? Its pretty simple: do they impact the world? Do they just sit dazed, looking at hands all day? Left to their own devices, are they capable of anything? Three classes of people get a title: Heroes, Nobles, and Villains. Heroes usually cause the impact that would allot them a title out of a simple desire to help people, such as John or Karkat. They actively strive everyday to improve themselves and make themselves a better person. As a result, its a relatively simple matter to determine their Classpect: what do they do? How do they impact things? In general, I consider myself a member of this class. There’s not simple litmus test, just take note of the impact that is taken. The second is Nobles, and these people don’t really earn their titles one way or another. These are the people who have a major impact just simply out of being, and don’t particularly work for good or for evil. Imagine them as Dungeon and Dragon’s “Neutral” row of alignments if you were to just cut out the “I don’t really care” True Neutrals out there. Even Nobles have a motivation of some sort, even if that motivation is something like unto “continue to survive and create my own impact”. I don’t know if anyone else knows these kind of people, but if you do, then this class of person is obvious. They are above somehow, and its almost impossible to define. Finally, then, are the villains. Villains are those who are willing to hurt others in order to get personal gain: they choose “B” in the Prisoner’s Dilemma (google that if you don’t know what I’m talking about). As a result, they can often come across as something else, but under these definitions, that is the best you are going to get.
Second we have the Aspect. There are twelve, and if you are reading this odds are you know them by heart. bladekindEyewear has an excellent post where he elaborates on how they form all the vectors that make up Time and Space. If you are really interested in the philosophy of Classpect, that would definitely be worth taking a look into. But more than that, they represent all the ways reality can be looked at it. From Space, which represents substance, reality, and the base elements of reality, to Time, which is progression, causality, and inevitability. As a result, there is a spectrum of each. The perfect balance of Time and Space would be everything that is and everything that could be, or realistically a perfect vision of reality, which every pair of Aspects makes up balanced to perfection. The Aspect is weighted in the calculus of Classpecting much higher than the Class. Even destroyer classes are dominated by their Aspect, even if they “ghost” a little bit of their opposite, as evidenced by Dirk, who is firmly stored in Heart territory despite being a little bit Mind-y every now and then. The trick comes in that they always advance their own Aspect with their actions, even if it means by destroying it. Of course, that is everyone: a person acting strongly in their Classpect will always tend to exert more of their influence, rendering things more in their perspective, like how a judge who believes more in black in white morality will render things in the world in a more black and white perspective.
Understanding that Aspect is more than Class makes the reset of this business a great deal easier. Just take the Class and apply it to the aspect. For a Thief of Time, just remember the Thief’s function: to take things, then to use their supply control. A Thief of Time, therefore, is dominated by their worldview: they see things as inevitable, leading to a single point, with no variation. In that sense, they are quite happy to be the one using the inevitability to their advantage. And how does one take control of proceeding events? Why, by striking at precisely the correct points! Its rather simple to understand what it means to interact with an aspect in a simple manner, and then interpret that to a Classpect, then simply extrapolate to gain a greater understanding of the title in general. Yes, it might be counterintuitive, but just remember first worldview, then apply the class, and it should be relatively simple.