SPOILER FOR GAME OVER NEW READERS BEWARE


I think that one of my fav terezi moments in all of homestuck is the first "courtcase" we see her act out where she LOSES the coin flip, flipping the one that means lemonsnout should be free to go, then hitting us with "What coin? The prosecution sees no coin. SHE'S BLIND REMEMBER?"
But in terms of something you could do in cosplay that's feasible, I think @hall is totally right. Her most aura farming moment is drawing an empty outline for a murder scene corpse, then dying and falling into the exact position she drew.