1. If you are a magical girl with a completely unique appearance and no means of covering your face...no one will recognize you when you are in your normal, everyday guise. Even if your face is all over newspapers and TV (Sailor Moon, Wedding Peach, etc)
2. No matter what kind of phenomenal, cosmic power a girl has her only real dream is to get married. (most magical girl animes).
3. guys will get nosebleeds if you rubs your boobs on them, if they think about your boobs, if your boobs accidentally brush them. (any romance/comedy series)
4. you can be a completely boring, generic, and otherwise irrelevant dude and women will fawn all over you (Ah! My Goddess, Tenchi, Sakura Diaries)
5. Everyone, no matter how cute, has a dark and terrible secret (Shuffle, Higurashi)
6. It's okay to fall in love with an AI, even if she has the conversation skills of a four year old (Chobits)
These are all I can come up with...