Charisma in Last Shelter Survival: What does it actually do for you?

Charisma is an attribute that is used by Celebrity(trader) bases only - it multiplies the buffs given by the Class Cards. Traders are unique in that they get class cards for each COZ or CoA activity, and the higher your Charisma, the higher those buffs are. You need to place cards for the activity with cards that increase Charisma, or the buffs will have no effect.