Fallout 3 Guide
There are 8 followers in total, and this section goes over each one of them.
Note: These 8 Followers automatically regenerate their health outside battle. That means you only have to be careful during fights themselves; Once the battle is over they'll be healed by the game.
Yes, bullyhead Butch can become a follower, that is if you lived through his painstakingly annoying conversations and actions during your youthful adventure.
Finish the Misc. Quest: Trouble on the Homefront and make sure that the Overseer has been killed or has stepped down, or sabotaged the Vault in its entirety. Look for Butch at the Muddy Rudder Bar at Rivet City.
o Karma does not matter when Butch has already joined.
You meet Fawkes during your main quest when exploring Vault 87. She won't immediately join you, but you can easily recruit him when you get out of Raven Rock. Oh, Fawkes is a woman, by the way. Or at least, she was. Now she's a Super Mutant, and those don't really have a gender either way.
Note: When Fawkes joins for the first time he doesn't seem to take a follower spot. This means you can already have a follower (or even have assembled a small party) before you recruit Fawkes at Raven Rock. Simply avoid her the first time when you get out - and recruit her later - to get the best result.
o Karma does not matter when Fawkes has already joined.
3. Sergeant RL-3
You can buy Sergeant RL-3 from a merchant who sells robots. He's named Mr. Tinker and he can be found nearby or around the RobCo Factory. It's a somewhat random encounter, so you may need to use the wait function for him to appear.
o Karma does not matter if Sergeant RL-3 has already joined.
Jericho can be found in Megaton. If you have negative karma and willing to pay him 1000 caps for supplies, he's very willing to accompany you to where ever it is you want to go.
o Karma does not matter if Jericho has already joined.
5. Star Paladin Cross
You can recruit this Brotherhood Lady in the Citadel, in the same room with Liberty Prime (the large robot). She's on the upper floor and only joins you if your Karma is positive.
o Karma *does* matter if Star Paladin Cross has already joined. Keep your Karma positive or she will leave you.
[KARMA: NO REQUIREMENT]
This ghoul can be found in Underworld at The Ninth Circle. You can buy his contract from Ahzrukal for 2000 caps (or 1000 with Barter at 50 ). It's also possible to get his contract by killing Greta at Carol's Place.
o Karma does not matter if Charon has already joined.
[KARMA: NO REQUIREMENT]
This lonely dog can be found fighting off raiders in the Scrapyard. Talk to him and he'll be a follower from here on. It doesn't seem like Dogmeat takes up a follower spot, which is a good thing.
o Karma does not matter if Dogmeat has already joined.
[KARMA: VERY EVIL]
She can be bought off Eulogy in Paradise Falls for 1000 Caps (or 500 with enough Barter skill).
o Karma does not matter if Clover has already joined.