Introduction
Understanding personalities is key to a long work career. Here is a matrix I came across and found it to be accurate & true. Once, you can categorize a person you can then better understand their decision making. This may help you in avoiding pitfalls when conflict arises.
Be aware that most people are a blend of two or more categories. However, one category is always dominate. So they may some traits listed below.
Also, not all experts agree that the identified traits are exclusive to each category. So take it with a grain of salt.

Analytical
Pro: Technical, task driven, avoids mistakes.
Con: Not able to commit, slow, indecisive, needs to be right. not able to communicate well, avoids others, does not volunteer data or results.
How to handle: Be clear and specific, don’t rush them, offer a solution they can evaluate step by step, & avoid yelling at them (emotional outbursts).
Driver
Pro: Results driven, prefers facts & data, likes to takes charge, appreciates quick decision-making.
Con: Impulsive (Does not consider all the facts), likes control, get it done at any costs, not concerned if data is correct.
How to handle: Be confident in your answers, get to the point, & present a clear and actionable plan.
Amiable
Pro: Gets along w everyone, wants to be liked, dislikes conflict, team player, supportive, prioritize relationships.
Con: Will lie when necessary, less assertive, unable to make decisions, can not say no.
How to handle: Reassure them that resolving the issue will not damage the relationship, encourage them to share their opinion, & emphasize the team and working together.
Expressive
Pro: Works quickly, persuasive, ambitious, social, high energy, likes new ideas.
Con: Talkative, exaggerates, attacks others, poor at planning, likes to be recognized, somewhat disorganized, dominates conversations, can be superficial and place image over substance.
How to handle: Actively listen to what they are saying, let them get a little emotional (helps prevent an increase in conflict), avoid being too blunt (they take criticism personally), & maintain a positive attitude (they like that).