Persistence can be a characteristic of a malignant narcissist.
Malignant narcissism is a term used to describe a severe and dangerous form of narcissistic personality disorder (NPD) that often includes a range of antisocial, manipulative, and even sadistic behaviors.

Malignant narcissists are known for their persistence in pursuing their own goals and desires, often at the expense of others. They can be relentless in their efforts to achieve power, control, and attention. Their persistence may manifest in various ways, such as:

1. Manipulation: Malignant narcissists are skilled manipulators and may persistently use deceit, coercion, or emotional manipulation to achieve their objectives.
2. Exploitation: They may consistently exploit others for personal gain, whether it’s financial, emotional, or otherwise.
3. Revenge: In cases of perceived slights or threats to their ego, malignant narcissists can be relentless in seeking revenge or retribution against those they believe have wronged them.
4. Control: They seek to maintain control over others through intimidation, domination, and psychological manipulation, and they persistently work to keep individuals within their sphere of influence.
5. Attention-Seeking: Malignant narcissists often crave constant attention and admiration, and they will go to great lengths to secure it, even if it means persistently seeking the spotlight.

It’s important to note that not all individuals with narcissistic traits or narcissistic personality disorder are malignant, and the level of persistence and harmful behaviors can vary among people with NPD. Malignant narcissism represents an extreme end of the narcissistic spectrum characterized by a combination of narcissistic traits and antisocial or sadistic tendencies.