Somewhat spoilers, if you noticed in the beginning of the game the vault tec rep is denied access at the gate. This is him 200 years later as a ghoul. He can not be your companion but he can be a follower at a base of your choosing. My Charisma is at 3 but maybe 4 in this video with a food buff. He is located at Goodneighbor. He is more of a follower type character because he can not go out and fight with you. He will go to a base you send him too but so far I can't get him too fight.

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