First of all, the game doesn't show girl's gold yet, so I cannot test it. As for exp, it should be excluded from the effect of cmax field (and gold too, if needed).
About effects, we need more than one poison effect (strong, normal, weak, etc.), or it should include specific values of reducing health (like poison(5-10), means random value between 5 and 10 every turn). Weak and strong mobs should have different poisons.
Athletic and Fragile should decrease/increase fatugue, I believe 1-2 per day should be enough. Artificial Body probably should decrease it too, unless the charater has Fragile as well. In that case they cancel each other out. Besides, Artificial Body should at least give immunity to poison, and maybe some other BE effects in the future.
Myabe healing/rest should work a liittle better with Tough and Athletic traits and worse with Fragile and Artificial Body.
Fleet of Foot and Dawdler we already discussed, there should be a probability to not spend AP/spend it twice than usual. In order to balance is properly, it should be once per day at best.
Sensitive not only means passive sex bonuses, but susceptibility to damage as well, no matter defence. Let's say, usual damage*1,1 or 1,2.
Magic Talent should restore mp, maybe 1-3 per day.
Yandere, Mind Fucked probably should cause random mood swings (=joy) from time to time. Maybe +- 10 and 20 respectively.
Depression and on a roll when joy is too low/high. Penalties/bonuses to max health and fatigue, maybe +-5-10% to girl's daily income.
Caught a Cold as effect instead of trait, penalties to constitution, joy, max health, fatigue. Probably will be applied with a certain probability when health is low, especially during the cold season (we have a calendar after all).
Small scratches, scratches, huge/horrific/whatever scratches as temporary, weakened analogs of scars. Only serious wounds lead to scars, but any wounds lead to scratches.
+/- 1 joy per day for Optimist/Pessimist, same for Collected, but aspiring to 50, maybe 60.
Penalties to any joy change for Impersonal, maybe *0.8 or even 0,5.
Extremely Jealous probably should have penalties to joy or even disposition every time MC spends time with someone else, if they already have, let's say, 500+ disposition. On the other hand, they gain more disposition when he spends time with them.
+- 5 libido for Nymphomaniac/Frigid per day.
Heavy Drinker and Always Hungry will buy liquor/food when they get a chance thanks to goodtrait field, so they probably don't need effects. Or maybe we need things like hangover and food poisoning for the excessive use
That's all for now, maybe I'll come up with something else later.