The list of what makes a serial bully is a long one and the full list can be found on the following site.

http://www.bullyonline.org/workbully/serial.htm

Out of interset - here are just a few off of that list.

The serial bully:

 has a Jekyll and Hyde nature - is vile, vicious and vindictive in private, but innocent and charming in front of witnesses; no-one can (or wants to) believe this individual has a vindictive nature - only the current target of the serial bully's aggression sees both sides; whilst the Jekyll side is described as "charming" and convincing enough to deceive personnel, management and a tribunal, the Hyde side is frequently described as "evil"; Hyde is the real person, Jekyll is an act

 uses excessive charm and is always plausible and convincing when peers, superiors or others are present (charm can be used to deceive as well as to cover for lack of empathy)

 relies on mimicry, repetition and regurgitation to convince others that he or she is both a "normal" human being and a tough dynamic manager, as in extolling the virtues of the latest management fads and pouring forth the accompanying jargon

 is emotionally retarded with an arrested level of emotional development; whilst language and intellect may appear to be that of an adult, the bully displays the emotional age of a five-year-old

 exhibits unusual and inappropriate attitudes to sexual matters, sexual behaviour and bodily functions; underneath the charming exterior there are often suspicions or hints of sex discrimination and sexual harassment, perhaps also sexual dysfunction, sexual inadequacy, sexual perversion, sexual violence or sexual abuse

 holds deep prejudices (eg against the opposite gender, people of a different sexual orientation, other cultures and religious beliefs, foreigners, etc - prejudiced people are unvaryingly unimaginative) but goes to great lengths to keep this prejudicial aspect of their personality secret

 has a deep-seated contempt of clients in contrast to his or her professed compassion

 is a control freak and has a compulsive need to control everyone and everything you say, do, think and believe; for example, will launch an immediate personal attack attempting to restrict what you are permitted to say if you start talking knowledgeably about psychopathic personality or antisocial personality disorder in their presence - but aggressively maintains the right to talk (usually unknowledgeably) about anything they choose; serial bullies despise anyone who enables others to see through their deception and their mask of sanity

 undermines and destroys anyone who the bully perceives to be an adversary, a potential threat, or who can see through the bully's mask

 may pursue a vindictive vendetta against anyone who dares to held them accountable, perhaps using others' resources and contemptuous of the damage caused to other people and organisations in pursuance of the vendetta

 gains gratification from denying people what they are entitled to

 is spiritually dead although may loudly profess some religious belief or affiliation

 is mean-spirited, officious, and often unbelievably petty

 is convinced of their superiority and has an overbearing belief in their qualities of leadership but cannot distinguish between leadership (maturity, decisiveness, assertiveness, co-operation, trust, integrity) and bullying (immaturity, impulsiveness, aggression, manipulation, distrust, deceitfulness)

 is constantly imposing on others a false reality made up of distortion and fabrication

Responsibility

The serial bully appears to lack insight into his or her behaviour and seems to be oblivious to the crassness and inappropriateness thereof; however, it is more likely that the bully knows what they are doing but elects to switch off the moral and ethical considerations by which normal people are bound. If the bully knows what they are doing, they are responsible for their behaviour and thus liable for its consequences to other people. If the bully doesn't know what they are doing, they should be suspended from duty on the grounds of diminished responsibility and the provisions of the Mental Health Act should apply.