Yes. Just about every character in my novel has some sort of mental health issue. The notable ones are:
The Protagonist, Sherlock: Anxiety and PTSD, later Depression all caused by repressed events of his life he slowly starts to remember as the story progresses. He also has amnesia.
Beatrice Alice Moreau: Suffers from mental trauma brought about by watching her fathers' brutal murder and her near-death experience during that event. She also has developed a cold exterior because of it.
DEUCE, one of the antagonists: Who has developed a god complex and a warped view on peace due to being used as a slave like other Technocytes and thus taking the brunt of the evil humans are capable of conjuring and wanting to change that by any means.
All my notable characters for the most part suffer from PTSD and in the case of three of my protagonist. Some form of self-hate/loathing due to past failures such as Beatrice feeling she should've done more to save her father despite being a little girl at the time. Or another one of my protagonists who worked with her father and also has guilt over that as well as his criminal background.
With this story, I mainly want to highlight things such as PTSD and the effects of self regret along with how humanity is defined within a world where man, perceived monsters, and machines are not so different from one another.