Logan is a man you meet in Fourville.
From the author page at Nexusmods; “A substantial quest mod which adds a new town to the Commonwealth. Features ten main, thirty-six side quests, a fully-voiced player, over 5,000 lines of new dialogue, a new set of collectible bobbleheads with perks, and plenty to explore and discover. Approximately 8-10 hours of new gameplay.”
I had Logan as a follower for a long while! Logan is very well-voiced and was a nice companion.
Fourville mod: https://www.nexusmods.com/fallout4/mods/43979
Fallout: London mods used within the larger Fallout: London mod.