To the extent that we have choices about who we work or spend time with there are three groups of individuals that I am generally wary about - and keep my distance from. And, I would not choose to have them as colleagues or staff - if they were unable to address their issues.
Those who leave a trail of hurt or wounded people behind them. These can be highly successful people but their ambition and drive cause them to use people to achieve their ends even when it ends up hurting those very people. When there is a trail of bodies behind an individual, no matter how successful they are, there is a fatal flaw that does not reflect Jesus.
Those who are passive aggressive in their behavior. This can be crazy making because to your face these individuals are agreeable but behind your back and with others they can be be doing just the opposite. But because the behavior is not up front and honest it can be hard to pin down. The behavior is a form of dishonesty and double dealing that hurts the team or organization.
Those with significant hubris. Unchecked egos cause individuals to make selfish decisions that are primarily about them rather than the organization or team. Since healthy teams are built on the good of the whole unchecked pride is incompatible with team health. Whenever it is more about us than the mission we have a serious problem. Prideful people usually don't treat others well as life is about them.
It is not unusual for leaders to need to address these kinds of behaviors. To the extent that I can avoid them I do. I don't need the drama!