Fallout 3 companions

Permanent companions
There are 8 permanent companions available to the player in Fallout 3. Most have a Karma requirement that must be met if the player wishes to enlist that companion (listed here in parentheses).

Pictured, left to right:
 * Star Paladin Cross: Brotherhood Paladin (Good)
 * Butch DeLoria: Tunnel Snake (Neutral)
 * Clover: Paradise Falls Slave (Evil)
 * Sergeant RL-3: Mister Gutsy Robot (Neutral)
 * Jericho: Retired Raider (Evil)
 * Fawkes: Super Mutant (Good)
 * Dogmeat/Dogmeat's Pup: Dog (No Karma Requirement)
 * Charon: Ghoul Bodyguard (No Karma Requirement)

The player is limited to enlisting Dogmeat plus any one other companion, barring certain companion exploits.

XP
Unlike previous Fallout games, companions don't gain experience and notoriety independently but are scaled to the level of the player.

The player earns full XP if able to do the majority of the damage that kills the opponent (you get zero XP for a kill unless you manage to do at least 30% of the damage). A killing blow is not necessary, nor will it grant XP if too little damage has been done.

Combat
Companions come with their default weapons and armor and will use these, depending on what role you ask them to play (melee or ranged). They will also wear any weapons or armor they are given that is superior to their standard equipment. All human or ghoul NPCs are capable of wearing Power Armor, excluding Fawkes as he is a super mutant). Armor and weapons worn by companions never degrade with use.

Companions have unlimited ammo for their standard weapon (With the exception of Butch), but you'll have to supply them with the appropriate ammo for any other non-default ranged weapon.

If a companion is given several weapons and the appropriate ammo, they will generally choose a weapon based on the range of the projectile, then on either damage per round (DPR) or damage per second (DPS) but not by the in-game interface's DMG stat. For example, if you equip Star Paladin Cross with a flamer, she will first attack with her default laser pistol because her target is out of the flamer's range. She will move towards the target to get into the flamer's range and then switch to it. There are exceptions, however. For example, Charon will always use Protectron's Gaze (a unique laser pistol) over the laser rifle, despite its reduced range AND damage per round rating.

Some companions will use any weapon if you give it to them (provided they have appropriate ammo for it). There are some exceptions however, for example companions cannot use the Gauss Rifle rewarded upon completion of the Operation: Anchorage DLC, but can utilize the sim-only version obtainable through glitching or console.

Companions have significantly more health than other NPCs.

Companions are restored to full health at the end of combat, after all nearby enemies are dead. However, if you zone out during a fight and they follow while injured, or if they are injured outside of combat (e.g. a booby-trap), they do not heal (until after the next combat). They can also use stimpaks in their inventory in the middle of battle, if you gave some to them earlier. Dogmeat can't carry stimpaks, but you can speak to him in the middle of combat to heal him manually. You can check companions' health by viewing them in VATS mode, or moving far enough from them to see their HP bar. Companions are not considered 'vital' NPC's, so they will die if their health is fully depleted, there is no way of reviving them.

Some companions will enter sneak mode when you enter sneak mode, and end it when you do. They may also randomly enter sneak mode during combat, presumably to avoid enemy fire or to gain better aiming.

Statistics

 * For a detailed list of the companions' equipment, see Fallout 3 companion equipment.
 * Carrying capacity will be, e.g., 50 pounds less if given Power Armor (45 for armor, 5 for helmet). Capacity is determined by: (Base of 150) + (10 * Strength) - (Weight of inherent gear) - (Weight of anything else, including replacement armor or weapons)

Firing permanent companions
In most cases, companions can be dismissed/fired, and can later be found and rehired. In most cases, when fired they always travel to a specific spot, usually not the same spot they were hired. In some cases, they can always be rehired by simply finding them and asking them to rejoin you. In some cases, there will be Karma or other requirements. For example:


 * Fawkes: If fired, Fawkes will travel to the Museum of History where he will wait for you just inside the front door. You can rehire him any time so long as your Karma is good. No charge or other requirements to rehire him.
 * Sgt. RL-3: If fired, will travel to the entrance to Canterbury Commons (at the traveling merchants' stop near the trees), where he can be rehired so long as your Karma is neutral. No charge to rehire him.
 * Star Paladin Cross: If fired, returns to The Citadel. Can be rehired any time, but only if Karma is Good.
 * Butch: If fired, returns to the Muddy Rudder in Rivet City. Can be rehired any time, but only if Karma is neutral.
 * Dogmeat: Isn't really "fired," waits by Vault 101 as ordered.
 * Jericho: If fired, returns to Megaton, he is found inside Moriarty's Saloon, unless you have blown up Megaton, then he just waits at the ruins. You must have evil Karma to re-hire him.
 * Charon: If fired, he will return to the Ninth Circle Bar. He can be re-hired anytime.
 * Clover: If fired, she will return to Eulogy's Pad in Paradise Falls (even if the player has killed Eulogy and abolished slavery by wiping out everyone in Paradise Falls). She can be rehired regardless of Karma.

Temporary companions
Temporary companions are companions that will join you during a quest. Most of them will follow you indefinitely until you complete their related quest, but not all. Unlike permanent companions, they do not heal automatically at the end of a battle but must be given stimpaks through reverse pickpocketing or healed through dialog (still requiring a stimpak from your inventory).
 * Bumble
 * Cherry
 * Doctor Li (only during The Waters of Life) and her companions (Garza, Daniel Agincourt, and Alex Dargon) (Note that only Li technically follows the Lone Wanderer; the other three simply follow her.)
 * Red
 * Sarah Lyons (only during Take it Back!)
 * Shorty
 * Sticky
 * Sydney

James is scripted as though he were a permanent companion; for example, he uses up ammo on playable weapons, something only permanent companions do. However, his package is "escort" instead of "follow", so he can't be taken places like a normal companion can be.

Operation: Anchorage only:

 * Sgt. Montgomery.
 * Strike Team Grenadier.
 * Strike Team Infantryman.
 * Strike Team Missile Unit.
 * Strike Team Mister Gutsy.
 * Strike Team Sentry Bot.
 * Strike Team Sniper.

Mothership Zeta only:

 * Elliot Tercorien
 * Sergeant Daniels
 * Private Beckett
 * Paulson
 * Toshiro Kago
 * Somah
 * Support Drone
 * Guardian Drone

Bugs
Please see NPC bugs.

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