I find a lot of people define classes with things like tendencies, if that makes sense. For example witches tend to be bubbly and also tend to cause huge defining events. Damara's not exactly bubbly but I suppose that's why it's a "tendency" rather than a defining trait.

For example, Jade, overall can be bubbly and fun, did the whole thing in transferring the Beta kids to the post-scratch universe, a pretty vital and huge event.

Feferi, definitely bubbly, both literally and descriptively, taking part in having the dream bubbles be established, another big defining event.

Damara and her meddling of her session out of vengeance, also a big defining event for the dancestors.

I've done a ton of classpect research but ironically I don't actually know much about rogue quite yet lol. I do know that Heirs do have a tendency to be in their own world so to speak, go along with things on their own path, and become the inheritor of their aspect both literally and/or figuratively. Overall, a relatively passive class.

Seers have a tendency to be very informed on things they're interested in, and tend to be very witty with their wording (look at Rose and Terezi, possibly Kankri if you consider his lengthy lectures as being "witty", but maybe it's less about the wittiness there and more about the fact that information is being portrayed in an unorthodox fashion? Hard to say, really.)

A good place to start imo is find characters that exist in canon that you feel like you can vibe with, then look at others with similar classes/aspects and see what traits those ones might have (both personality-wise or narratively) you can also relate to.

For me personally, I was able to find out my class as being Mage due to a lot of elements I can relate to in Sollux and Meulin, as well as popular descriptions of mages learning more from experience than information like a Seer would.