Charisma/Fallout 3

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

Gameplay
Modifies: Speech and Barter skills, NPC Disposition

Charisma increases the disposition of all NPCs, which makes Speech checks easier. Disposition is also affected somewhat by Karma (most NPCs like good characters more), quests (doing a quest in a way an NPC likes can dramatically boost disposition), and dialog options (being a jerk in conversations can lower disposition a little). Charisma also affects Barter and Speech skills. Characters who use Speech will want at least a decent Charisma, but adding points to the skill are almost always better than adding points to the score. Characters who do not use the Speech skill have little use for this SPECIAL score.

There are also general Charisma checks in dialogue with some characters, in addition to Speech checks. Avoid wearing things like Enclave Power Helmets, as they deduct 1 point of Charisma while equipped.

Permanent

 * Bobblehead - Charisma (+1)
 * Intense Training perk (+1)
 * No Weaknesses perk (will raise base to 5, if below 5)
 * Almost Perfect perk (will raise base to 9, if below 9)

Temporary

 * Alcohol (effects do not stack)
 * Beer, scotch, vodka, whiskey, wine (+1)
 * Moonshine (+2)
 * Armor and clothing
 * Eulogy Jones' suit, regulator duster, sexy sleepwear, sheriff's duster, Tenpenny's suit, Vance's longcoat outfit (+1)
 * Eulogy Jones' hat, T-51b power armor helmet, Three Dog's headwear (+1)
 * Winterized T-51b power helmet (+1)
 * Ashur's Power Armor, Leather Rebel (+1)
 * All-nighter nightwear (+1)
 * Grifter's Fit (+1)
 * General Chase's overcoat, Paulson's outfit (+1)
 * Chems
 * Ant queen pheromones (+3)
 * Grape Mentats (+5)