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You can get more than one companion by exploiting glitches in Fallout 3, there are many of them, so I won't list them here since you can just search and find them on Fallout 3 Wikia.
Be aware that there are only two slots on the Fallout 3 game:
(Npc slot: Either Butch, Charon, Fawkes, Clover, Jericho or Cross) (Dogmeat slot.)
Having more than one companion in the Npc slot will cause a lot of bugs and start ruining game experience, it's up to you though.