Yes, they are. The criminals in Mindhunters are created for the story and are not based on real individuals.
Most of the criminals in Mindhunters are fictional. The show's creators crafted these characters to drive the plot and add drama. However, they might draw inspiration from real criminal behaviors and profiling techniques.
Definitely fictional. Mindhunters is a fictional drama, and the criminals depicted within it are made up to entertain and engage the audience. Though the show may incorporate elements similar to real criminal cases, the specific criminals themselves are not real.