I know what you mean, when I first started reading it, I didn't want to go to sleep. Darn addictive comic shenanigans.
The blind girl is Terezi, she's also awesome, but I didn't quite get her personality. Vriska is bipolar or something so we know she's totally unpredictable. But Terezi is unpredictable in an annoying way. Her and Dave's relation is adorable though. Also, adiosToreador is Tavros :3 Poor thing.