Say you went to school and made a friend. Sure, you might talk about school-related stuff at first, but then you'd want to talk about other things. That doesn't make the name "school" misleading. It just means you also talk about other things.
Wow, that seemed a bit unneccessarily rude... On the topic, I have been asking for this for years, which is why I'm so excited about the DDD secret ending. I mean, I don't think she'll be a main character in her own game, but I'd at least like to see her get some playabiity now.