Regarding mental illness in Dragon Age
There might be happy and well-adjusted people somewhere in Thedas, but we certainly don’t encounter many of them!
Almost every single NPC we meet has experienced at least one traumatic event sufficient to cause PTSD.
On top of that, the oppressive political/economic/social systems in Thedas are inherently abusive to the vast majority of the population and thus there is probably quite a lot of complex PTSD as well. (For those unfamiliar with the distinction, complex PTSD is emotional trauma caused by being trapped in a long-term abusive or otherwise threatening/harmful situation versus regular PTSD is usually tied to specific significant events.)
Furthermore, the people of Thedas have almost no resources to cope with mental illness:
1) The scientific study of psychology (as distinct from general philosophy) is a post-Enlightenment endeavor whereas societies in Thedas are still in pre-Enlightenment stages of development.
2) There is little to no understanding of the brain. Thedas even lags behind the equivalent historical era on Earth with regards to knowledge of anatomy and non-magical medicine because research in this area is considered too close to practicing blood magic.
3) There are no psychiatric medications – those are a 20th century invention.
4) Fetal alcohol syndrome is likely very common due to most people drinking fermented beverages instead of water because the water wasn’t safe to drink.
5) Prenatal and early childhood malnutrition are also likely very common, and cause mental disabilities. For example, the average IQs of iodine-deficient populations are ~15 points (a standard deviation) lower than non-deficient populations.
6) Childhood tragedy in the form of the death of a parent or sibling is frightfully common. At least one in ten women eventually dies in childbirth and only two-thirds of children to live to see their fifth birthdays.
7) There is no universal public education, no child protective services, and very little social mobility. If your family is abusive, neglectful, or otherwise toxic there is likely no one to notice and intervene on your behalf and almost no hope of eventually escaping to a better life.
Don’t argue over which Dragon Age characters are mentally ill. Argue over whether they are any that aren’t.