Jan is a smart and witty girl who is a loner at school but takes things seriously. In The Time Tunnel, she makes a period artifact mister, which may be a device used to protect and preserve artifacts, which shows that she has creative thinking and problem-solving skills. Additionally, she has a great deal of thought and concern for people in the future, which shows that she has the ability to be visionary and thoughtful.

In summary, Jan is an intelligent, conscientious, lonely but innovative and visionary girl.