Wait wait, so that means they didn't show Haruka's prank? No wonder some people are wondering about her character portrayal. The dictionary scene (if you chose to lend it to her) wasn't enough to flesh her out at the outset; it's the subsequent late prank she pulls, coupled with the disciplinary committee taking her away, that I personally was able to go "Oh, so she's a prankster, huh?"
And my impression about Anego during her fight with Masato was "this girl is frigging dangerous". She presented a different, serious, more potent vibe than Masato in that time. In fact, it would not be until a scene in the introductory part of her route that I was shown that she could be higher degree scary, thus putting the first scene in perspective.