Obviously I'm going for classes and aspects.

Hussie made such an interesting system for superpowers I absolutely love it. Of course I'd go over what every aspect represents and their associations, and how every class interacts with any given aspect. However, the biggest thing I'd focus in on is the reasons why people are classpected the way they are! Aspects are all narrative focused. Aspects like breath, light, and doom are the most obvious ones, but anyone's given classpect will always align with the way they interact with and impact the story they're a part of, OR it aligns with what their goals are, even if they don't fulfill them. Like how Eridan was a Prince of Hope but was super shitty at it and didn't actually destroy all hope, he only tried to. It's a huge part of Homestuck's whole thing about being a story that's very aware that it's just a fictional story. It's why Hussie including their self insert is actually a good narrative choice.

A good example of this concept come from Vriska, who's a Thief of Light. Light relates to luck and knowledge, particularly knowledge that's important for the reader to know. The luck part ties into the other part because if the story needs something to go right, it will. Vriska literally steals the spotlight of Homestuck! It's why she's such an important character. Because part of light relates to anything that's narratively important. It's so cool!!! I'm so fucking autistic about this shit!!!!!!