Riddler posjeduje apsolutno sve simptome narcističkog poremećaja ličnosti koje, pri dijagnostici, propisuje DSM-IV.
Za razliku od narcističkog poremećaja, Riddler ne manifestira sve simptome OCPD-a po DSM-u, ali je njihov broj dovoljan da bi se bez problema mogla postaviti ova dijagnoza.
Peterson BS, Pine DS, Cohen P, Brook JS (2001). „Prospective, longitudinal study of tic, obsessive-compulsive, and attention-deficit/hyperactivity disorders in an epidemiological sample”. J Am Acad Child Adolesc Psychiatry40 (6): 685–695. DOI:10.1097/00004583-200106000-00014. PMID11392347.
ew.com
ew.com
„Batman 3”. Entertainment Weekly. October 1, 1993. Arhivirano iz originala na datum 2008-09-21. Pristupljeno 2008-08-16.
Cindy Pearlman (December 17, 1993). „Flashes: No Joker”. Entertainment Weekly. Arhivirano iz originala na datum 2008-09-21. Pristupljeno 2008-08-16.
Peterson BS, Pine DS, Cohen P, Brook JS (2001). „Prospective, longitudinal study of tic, obsessive-compulsive, and attention-deficit/hyperactivity disorders in an epidemiological sample”. J Am Acad Child Adolesc Psychiatry40 (6): 685–695. DOI:10.1097/00004583-200106000-00014. PMID11392347.