In scripts\characters\descriptions.gd, fear-related colors are wrong, I think. The code says:

    if person.fear <= 20:
        text += '[color=yellow]$name is not really afraid of you. [/color]'
    elif person.fear <= 40:
        text += '[color=#adff2f]$name has some concerns about your anger. [/color]'
    elif person.fear <= 60:
        text += "[color=green]$name knows well you can punish $him swiftly. [/color]"
    elif person.fear <= 80:
        text += '[color=#adff2f]$name shows heavy signs of fear with you around. [/color]' 
    else:
        text += '[color=#FFA500]$name trembles with fear whenever you are mentioned. [/color]'

while, to be consistent with the rest of the description, it should be:

    if person.fear <= 20:
        text += '[color=green]$name is not really afraid of you. [/color]'
    elif person.fear <= 40:
        text += '[color=#adff2f]$name has some concerns about your anger. [/color]'
    elif person.fear <= 60:
        text += "[color=yellow]$name knows well you can punish $him swiftly. [/color]"
    elif person.fear <= 80:
        text += '[color=#ffa500]$name shows heavy signs of fear with you around. [/color]' 
    else:
        text += '[color=#ff4949]$name trembles with fear whenever you are mentioned. [/color]'

I agree that the colors do seem weird for fear.  It probably is the result of the weird mix of mechanics underlying the fear stat.  I think it's worth noting that fear and obedience have similar usages and the dev has stated as much.  Low fear could represent a problem if obedience was also low; however, fear slowly changes into obedience over time so it seems reasonable to expect it to be low for most slaves.

If stats are colored according to their usefulness to the player, then like obedience low fear would be red and high fear would be green.  But problems are generally indicated by orange and red colored statuses, and it's not the case that low fear is a problem.

I would be in favor of either matching obedience's colors or using the higher value between obedience and fear to select the color for both lines.

afaik, slave fear around 30 = light green
80=orange and around 50=perfect green

0 is yellow

in my opinion fear system works nearly great, slaves should knows its bad idea to made you angry, but too mush fear should be bad
+ you dont need to rule with fear, you can build ur mansion on loyality and trust