An "enigmatic character" refers to someone who is mysterious or difficult to understand. They may have hidden motives or qualities that make it hard to figure out their true nature or intentions. Full definition
This workshop will focus on all forms of character: main characters, minor characters, characters drawn from history, and that ubiquitous but enigmatic character known as «I». (crmuseum.ca)
There is a confusing enigmatic character to the spiritual life in general. (nakedpastor.com)
A rabbit hole of enigmatic characters and swampy motives... Shot by shot, the film has a burnished, beautiful sheen. (rottentomatoes.com)