re: vampiricritical
I wasn't really thinking about the Earth C kids w/ this tbh, but if I had to guess I'd say:
Vrissy -- Witch of Mind
Tavvy -- Heir of Doom
Harry -- Prince of Space
Yiffy -- Thief of Time
Vrissy is an obvious Light pick, but I think it would actually be more interesting for the story for her to not be a Light player, and instead be something else. The dynamic between Vrissy and Vriska has always interested me, and I'd be absolutely fascinated to see how Vriska reacts to her alt-self (so to speak) having a completely different class and aspect, not to mention how Vrissy would feel about once again failing to follow in Vriska's footsteps. It would be a real test both of Vriska's ego and of Vrissy's sense of identity. Also yadda yadda ceruleanblood mind control witch of mind connection.
Tavvy I feel is an absolute lock to be an Heir of some sort, what with his quiet demeanor and the fact that he's literally an heir. With regards to aspect I could really go with anything, but Doom is by far and away the most underexplored in Homestuck proper, so that's my pick. He's also got a pretty big anxiety disorder going on and I think it would be hilarious for him to freak out over the fact that he's an Heir of Doom specifically.
Harry's a real wildcard here. I really have no idea what to make of him. You could convince me of almost any class or aspect, but I picked Prince of Space simply because it sounds the most interesting. What would it mean to destroy space itself, or use space itself to destroy? I feel like Harry would love the idea of being a Prince of Space. Him being a Prince, one of the more active classes, would also be a rather stark contrast to his mother and father, who are both members of passive classes. It doesn't super-match with his current character, but I have a feeling that's where his arc is going. I also just think it would be valuable for narrative purposes to have a Prince who isn't a "bad guy", since the only ones we know of are kind of ... morally questionable. [+ I think he would totally dig the God Tier Prince Outfit]
Yiffy is another wildcard to me. Possibly even moreso than Harry. We really don't know much at all about her, other than that she's a total brat. So, going off of that, I think Thief is the most obvious class for her. With regards to aspect, I'm kind of at a loss. Time sounds cool to me, especially in combination with the Thief class. I'd be interested to see how that works.
8ut you already knew that, right?