Dagnar is a very simple follower that can be found in the Drunken Huntsman in Whiterun. He is a skilled stealthy archer and used to be a member of the Dark Brotherhood. For more information about him, check his inventory.

• light foot perk
• essential
• marriable (will open a general goods shop)
• will tolerate criminal behavior
• will stay in the area that you dismiss him for easy retrieval later
  

Dagnar should work with or without any DLC. He should also be compatible with any follower mods as long as this mod is loaded before them.