When did I say anything about tsunderes? Also, you calling Kyou tsundere is proof you haven't played the game. She was made tsundere in the anime; she's not one in the game.
Also, I never said Nagisa didn't grow. Yes, she grew a bit but, she didn't change much. Anyway my point was, there are potentially more interesting and stronger characters. You said you liked Nagisa in ep. 19, right? She never behaves like that in the game; the behaviour she displayed in that episode is Tomoyo's behaviour.