Sasha Waybright, Thief of Blood
Blood: Relationships, responsibility, teamwork, promises, loyalty, friendship. Thief: One who steals their aspect or steals by means of their aspect, hoarding it for themself.
A classpect tries to answer the question: What does this character do? How does she act within and upon the narrative? How does she constructively, consistently influence the unfolding of reality? What's her calling card, her modus operandi, her thing?
For Sasha, the answer is undoubtedly "manipulate and coerce people into getting what she wants." (I hope it doesn't stay that way! But that's what it is now.) A prime example is the mix of cajoling and veiled threats that she employs against Anne in Reunion, both in the flashback and in the present. This could reasonably be interpreted as either “controlling loyalties” (Witch of Blood) or “stealing relationships” (Thief of Blood). I’m still on the fence, but leaning toward Thief for a few reasons.
Most importantly, Sasha makes all the major decisions within her clique: everything from setting the rules for sleepovers, to deciding what songs their band will play. She steals Blood-as-responsibility from her friends, robbing them of the power to make choices for themselves.
Second, even to the extent that Sasha's behavior can be construed as “controlling loyalty,” she’s usually binding people to herself. This applies not only to Anne, but to the toads as well. She befriends her guards while imprisoned, stealing their (admittedly slim) loyalty from Grime. (On the other hand, she does eventually bind the toads to Grime—a point for Witch or Rogue, I suppose. But it's not unheard of for a Thief to share her spoils.)
And then there’s the matter of her subrole. Getting the girls to ditch school—something that's happened on multiple occasions—is an extremely Page of Breath thing to do. So is fostering her toad guards frivolous interests (performing, gardening). I don’t put too much weight on subroles, since not everything always lines up neatly with Homestuck’s system—but I think it does here.
Also like, come on. She's Captain Hook.