Well, note as well that, for example if you attack a child with a troll barbarian, he might want to fight with him, you might be interested to make certain monsters like childs, goodwives, and other monsters like goblins, to want to run away from, say, trollish PCs, etc.
I know. If you want to make it easier, you can make 'scary' points.
for example, if your PC is a troll he has +15 scary points, and will scare goodwives. but if he is a hurthling he'll have 2, and goodwives will want to fight him.
In other words
FEAR PTS. RESISTANCE
Child = 1 (More than that = run away)
Goodwife = 5
Farmer = 10
There could be other factors that increase such meter, like wielding weapons or being disarmed, etc.