Instructions on how to write a 'Character Study'?

I was wondering what the basics are to write a character study, which elements are key to write one well?

I have absolutely no idea how they are written, (what tone are they usually written in etc.) and where to even start, so any ideas or advice would be very helpful. :]

(this is for school, we watched a movie and have to apply the changes of the character from the beginning and then from the end to epistemology for my philosophy class)

I just need help with the way to write this thing.
Thanks!
 
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