A bit of knowledge can be useful!

The book Personality Types by Don Riso with Russ Hudson lays out in detail the healthy, average and unhealthy behaviours of each of the nine personality types (and 18 subtypes) according to the Enneagram of Personality Types. An example of the lower levels of one particular subtype is described as follows:

'They easily dominate their environments, particularly other people. At the lower levels, they can become extremely aggressive and belligerent, bullying others to get their way and walking around with a chip on their shoulders. People of this subtype may also use their resources to manipulate others, attempting to pressure them into bending to their agenda. They have little compassion for others and do not feel guilty for their actions. Nevertheless, they betray a certain insecurity about money and power, since they never feel that they have enough of either to make them fully independent or secure in life.

Unhealthy people of this subtype are ruthless and impulsive: they can say and do things which will later be regarded as either a stroke of genius or a fatal mistake. They can be offensive and tyrannical, verbally and physically brutish to others, lashing out at whoever has frustrated them or dared to resist their wills. They have explosively violent tempers and quickly get into a rage. They easily feel betrayed and resist any restraints upon their behaviour. Their manic tendencies reinforce their delusions of omnipotence. They may spend vast sums of money to feed their inflated notions of themselves. They tend to get out of control when they are anxious or feel threatened. Since they are susceptible to anxiety, they defend themselves against it by acting out, impulsively striking first, attempting to destroy before they are destroyed’.

The book was published back in 1996. Who did they cite as an example of this particular personality subtype? Donald Trump. [Note: The authors do not state whether anyone is a healthy or unhealthy example of their Type, it is left to the reader to decide for themselves].