Obtrusive GM preferences or favoritism (I.e. they prefer characters of a certain archetype and favor someone with X, Y, and Z but not allowing someone else to have X)
Coming from someone going through a depressive episode with anxiety issues, with a family history of like issues, I can see why. With no knowledge, it's laughably sad how bad some of the depictions can be. However, if done correctly, it can work.
Depression (for example) in a character would...