(http://i671.photobucket.com/albums/vv73/Tohme_Rhiazanho/th_VXATraitsImmunities.png) (http://s671.photobucket.com/albums/vv73/Tohme_Rhiazanho/?action=view¤t=VXATraitsImmunities.png)
I used immunities, though I think the kanji (taisei) is more accurately translated as Tolerance. Pretty much the same idea; this page of traits is for setting up elemental and status proficiencies and resistances.
The "*100%" is likely to mean "This class takes 100% damage from this element" or "This class is 100% susceptible to this debuff". The last drop down menu doesn't have this % value, but does refer to the States section of the database. Perhaps this indicates a full immunity to the selected debuff for the given class.
The strange this is that there is Elemental, Debuff and State in this list. The script also includes 4 parameters for a battler:
FEATURE_ELEMENT_RATE = 11 # ?????
FEATURE_DEBUFF_RATE = 12 # ?????
FEATURE_STATE_RATE = 13 # ???????
FEATURE_STATE_RESIST = 14 # ???????
The actual meaning behind those:
ELEMENT_RATE : Attribute Effectiveness
DEBUFF_RATE : Weakness Effectiveness
STATE_RATE : State Effectiveness
STATE_RESIST : Disable State
I guess Element and State are the affinity values for the class (how good a class is with that element/state), Debuff is how susceptible to a status they are and Resist is complete immunity (state effect is null against class).
Speculation at the very most.