I think, by this breakdown of four temperaments, you can put the right character.
The Temperaments are based on how people see the world via the Sensing or iNtuitive Preference.
- The Sensing types, being those who care more for things the way they are in present, just react to it. They can either prefer to accept it the way it is (Judging, so SJ) or experience it (Perceiving, so SP).
- The iNtuitive types are about possibilities and the future, which means things have to be changed, and change means decisions on what needs to be changed and how, so they invoke their decision making Preferences (Thinking or Feeling, so NT or NF).
NOTE: All of these personality types doesn't behave with absolute consistency; just tendencies.
SJ – Stabilizers (Traditionalist)/Security or Duty Seekers "The Thinker" (=dominant Melancholic)
...take pride in being dependable and trustworthy--if there's a job to be done, they can be counted on to put their shoulder to the wheel; are quite serious about their duties and responsibilities; believe in law and order; natural talent in managing goods and services; honor customs and traditions so strongly; working steadily within the system; and use all their skills to keep things running smoothly (in their business, family, community)
• ESTJ – Supervisors / Executives (President Shinra)
• ISTJ – Inspectors / Examiners (Tseng + Rude)
• ESFJ – Providers / Supporters (Barret)
• ISFJ – Protectors / Defenders (Cloud + Angeal)
SP – Experiencers (Improvisors)/Sensation or Action Seekers "The Talker" (= dominant Sanguine)
...are most at home in the real world of solid objects that can be made and manipulated and of real-life events that can be experienced in the here and now; strike off boldly down roads that others might consider risky or impossible; seek out adventure and show a constant hunger for pleasure and stimulation; generous to a fault--always ready to share with their friends from the bounty of life.
• ESTP – Promoters / Persuaders (Reno??)
• ISTP – Crafters (Vincent??)
• ESFP – Performers / Entertainers (Yuffie + Young Zack, pre-Angeal's Death)
• ISFP – Composers / Artists (Genesis)
NT – Theorist (Rationals)/Knowledge Seekers "The Doer" (= dominant Choleric)
...the problem solving temperament--particularly if the problem has to do with the many complex systems that make up the world around; an insatiable hunger to accomplish their goals and will work tirelessly on any project they have set their mind to; value intelligence, in themselves and others, so they prefer to not tell others what to do; and believe they can overcome any obstacle with their will power.
• ENTJ – Field Marshals / Chief (Rufus)
• INTJ – Masterminds / Strategist (Hojo + Sephiroth)
• ENTP – Inventors / Originators (Reeve/Cait Sith)
• INTP – Architects / Engineers (Cid)
NF – Catalyst (Idealists)/Identity Seekers "The Watcher" (= dominant Phlegmatic)
...strive to discover who they are and how they can become their best possible self; hold themselves to a strict standard of personal integrity, a dreamer and tend to work for a better future; have a unique talent for helping people get along with each other and work together for the good of all; and often inspiring others to grow as individuals and to fulfill their potentials because in contrast to The Rationals, they're not projecting their emotion / will never tell others what to feel; but to do.
• ENFJ – Teachers / Mentors (Bugenhagen?? Zangan??)
• INFJ – Counselors / Confidants (Tifa?? Nanaki??)
• ENFP – Champions / Advocates (Adult Zack, post-Angeal's death)
• INFP – Healers / Dreamers (Aerith)