"Quirks are very specific traits assigned to a player based on real-life data which give the player a bonus when triggered. "
The real life data , leads me to believe it's preexisting, maybe a year 1 feature and it doesn't lend itself to be editable or used on prospects.

UNFAZED = Excels when hitting with 2 strikes
BREAKING BALL HITTER = Excels at hitting BREAKING BALLS
RALLY MONKEY = Performs better when the team is behind
FIGHTER = Performs better when the team is behind 9th inning or later
SITUATIONAL HITTER = Excels at driving in a runner from 3rd with less than 2 outs

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