Henk Grijpstra (played by Rijk de Gooyer) is a protagonist in Fatal Error.
Detective partner, observant and methodical, handles field operations and interrogations. Rinus de Gier (played by Rutger Hauer) appears in Fatal Error.
Detective partner in early films, pragmatic and street-smart, replaced in sequels. Constanze Verboom (played by Willeke van Ammelrooy) appears in Fatal Error.
Independent woman, love interest to Grijpstra, often entangled in criminal cases. Commissaris (played by Jan Retèl) appears in Fatal Error.
Simon Cardozo (played by Frederik de Groot) appears in Fatal Error.
Colleague and friend, assists in investigations and provides backup support. Mevrouw Grijpstra (played by Marjan Berk) appears in Fatal Error.
Zoon van Grijpstra (played by Willem Bos) appears in Fatal Error.
Family member, minor plot impact with personal connections. Miesje Verboom (played by Joekie Broedelet) appears in Fatal Error.
Family member, minor role with personal ties to main characters.
