So reading the Homestuck books with Hussie's notes he mentions that Karkat is the most human of the trolls or something like that, and it makes me wonder who would be the most troll-like of the humans. First thought goes to John since he was the only one who was in a relationship by troll standards, other than the flushed quadrant, but i dunno

I’ve gotta give the title to either Rose, Roxy or Dirk. Rose straight up gets taught Troll Stuff and she has already a heavy interest in Xeno stuff BEFORE getting introduced to dirty Troll romance novels and books on Quadrant Exposition.

Roxy and Dirk, they both grew on Batterwitch-land, and Roxy specifically uses a lot of Troll Terms, Wriggling Day, makes reference to Pale Relationships, etc etc. So, either Rose, or Roxy/Dirk seem likely.