List of All of the followers
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Nightingale Follower: Nightingale Recruit, Found by the Blacksmith in
Riften.

Companions Follower: Sovenur, Found right outside of the Companion's
Guild House.

Theives Guild Follower: Victoria Brim, Found in The Ragged Flagon.

College Of Winterhold Follower: College Of Winterhold Student, Found right
outside the front of the College Of Winterhold after you pass the so called
"Mage" Test.