Originally posted by Apollonious
I quite like your concept of Priscilla, whose fear instinct has been repressed. However, for the survival and writability of the character, the fear instinct should not be completely destroyed. One example I know of where a person has his fear instinct suppressed is under intense emotional scarring. Like watch-your-family-die scarring. Traumatic events can completely block off the part of a person's brain in which he houses those emotions that provide a "weapon" to people around them. It can make their flight-or-fight reaction lean more often toward "fight", and make them more confident.