You will learn how to acquire and remove them by visiting the Field Hospital. The following page of the Darkest Dungeon 2 guide describes the characters' Quirks - i.e.
There are dozens of different quirks, positive and negative, in the game, but only a handful of those are useful, while there are some you should always stay away from. Next Bosses Necromancer Prev Quirks Negative. Recommended positive and negative quirks | Quirks Darkest Dungeon Guide.
Recommended positive and negative quirks | Quirks Darkest.