hey! i think if nagisa is hanging out with jake then dirk will run into him at one point or another. i'm cool with being persuaded. on to questions:

Does your character have any psychic abilities of their own? nope!
How intelligent would you consider your character? pretty intelligent. he's shrewd, if not as knowledgeable about people as he thinks he is, and definitely an intellectual - the kind of person that seeks out knowledge and mentally challenging activities for fun. he likes learning, thinking, and analyzing stuff.
How stubborn or strong-willed would you consider your character? EXTREMELY. could be a superpower in its own right.
Is your character afflicted with any mental disorders, or other mental issues that would affect their stability? anxiety and paranoia related to and triggered by various things, but in particular loss of control. it might not be something that would directly interfere with the persuasion ability itself, but his reaction to finding out that he has been manipulated in this way would NOT be pretty.
Does your character drink alcohol or use mind-altering drugs on an unusually frequent basis? nope!