Adjust your style and role during the interviews (friendly, strict, role model) and ask how these changes affect the candidate.
Engage your candidate in a communicative role play based on the example of the character type he finds difficult to deal with.
Create certain difficulties for your candidate during a role play ('this cannot happen'; 'you cannot do this'; 'this does not work this way') and encourage your candidate to deal with these problems strategically.
Determine what prevents the candidate from adjusting to others. Find out what standards he has set for his own achievements. Are there certain types of work for which he displays more ambition? What kind of work?
What goes well and what could be improved? Discuss candidate’s report with the candidate.