Followers are said to be limited to one at a time but there are several ways to exploit this limit.
The following characters are triggered to follow you by a quest and don't replace your main follower. However, neither their inventory nor the followers commands are available.
|Esbern and Delphine||Alduin's Wall||Proceed in the quest normally, tell them to follow you when asked and don't enter Sky Haven Temple.|
|Barbas||A Daedra's Best Friend||Barbas starts following after you are prompted to retrieve the Rueful Axe.|
|Eola or Brother Verulus||The Taste of Death||
|Mercer Frey||Speaking With Silence||Proceed in the quest until leaving Snow Veil Sanctum.|
|Maurice Jondrelle||The Blessings of Nature||Maurice asks permission to follow you after you retrieve the Nettlebane and accept to run another errand for Danica Pure-Spring.|
|Thonnir||Laid to Rest||Talk to Thonnir by the cave and accept his help.|
|Enmon||The Heart of Dibella||Enmon will offer to follow you in search of his daughter.|
|Farkas or Vilkas||Purity||
Agree to help either of them to cleanse the beast blood. Vilkas will also follow you during Purity of Revenge aswell.
|Brynjolf||Trinity Restored||Do not enter Nightingale Hall after Karliah enters.|
The following characters do not work for the purpose described above. Although they are triggered to follow the Dragonborn for a while, fast travelling to any other place doesn't bring them along or they simply walk back to their original location afterwards.
|Avulstein Gray-Mane, Geirlund and Vidrald||Missing in Action||Travelling a few steps further the Northwatch Keep make them stop following.|
|Anska||A Scroll For Anska||She does follow in fast travel but returns to High Gate Ruins after a while.|
Dark Brotherhood Followers
It is possible to use a small glitch to hire followers which have regular commands available as well as their inventory.
|Dark Brotherhood Initiate (male)||Where You Hang Your Enemy's Head||Finish the aforementioned quest.|
|Dark Brotherhood Initiate (female)||Where You Hang Your Enemy's Head||Finish the aforementioned quest.|
|Cicero||The Cure for Madness||Spare Cicero's life|
Dismiss your follower, then immediately rehire them. Then prompt the conversation with the Initiate or Cicero. If you are fast enough, the dialogue displays the option to hire the Initiate, even though you already have someone following you. The Dragonborn can do this repeatedly so he/she has their follower, two Dark Brotherhood initiates, and Cicero all following him/her. This can also be done with Serana.
Mage followers may summon creatures to aid in battles. The dovahkiin can also give their follower (not necessarily a mage follower) a staff of zombies/reanimation/revenants, or a staff of flame/frost/storm atronach - meaning they will sometimes summon an atronach or reanimate a dead body when in combat.
|Aranea Ienith||Flame Atronach or Frost Atronach|
|Esbern||Flame Atronach, Frost Atronach, or Storm Atronach (on higher levels)|
|Brelyna Maryon||Flame Atronach|
|Eola||Flame Atronach and Reanimate Corpse|
- Excellent and informative post! Thank you!