Charisma/Fallout 2

Charisma is one of the seven primary statistics in the SPECIAL system.

Gameplay
Charisma determines the number of base companion slots the player character is given. This number is equal to their Charisma score divided by two, rounded down. As an example, with a Charisma at five, two can be recruited. Please note that one companion can still be recruited (in a few cases) even with the lowest Charisma score. A predesigned Charisma-based character is Chitsa.

Increasing

 * Install the blue memory module into ACE, then request the following surgery. Charisma will be increased by one.
 * Take the Gain Charisma perk for another point.
 * Having the mirrored shades, obtained from Mason (Salvatore's Bar, must be looted) or one of the graves in Golgotha, active in one of the item slots increases Charisma by one point.
 * Use some Mentats for a temporary +1 Charisma.