If a person were to change behavioural characteristics and thus personality due to circumstances, would the person change their classpect? Or does the classpect take into account how the person has changed?

Classpects take into account your true nature- That with which you feel happy, comfortable and identified with, that comes absolutely naturally and with no effort. If there’s some traits or characteristics changed due to circumstances, it’s often because said circumstances are pushing you into a bad spot (And as such further away from your Classpect), or are getting better (In which case they only push you more towards your Classpect).