It would be systematic because your not persuading them to do anything and assertive is about your personality. Systematic means to do something according to a plan or system.
In paragraph 14, you just need to look at the text and think about what the paragraph is mainly about, then you’ll have your answer
In the first sentence, the "he" is a nominative as it is a subject.
In the second sentence it is an object as the form "me" is actually "I", but "i" is a nominative form and "me" is an objective form.
In the third sentence "Us" is also used in objective form as "us" is an object of an action by "my sister".
I would say warriors as common noun refers to a concept to a particular individual .