Utility or Mixed Usage
Utility or Mixed Usage NPCs are a rare breed of NPCs that do not fit neatly within the broad Kink based NPC or the more verbose Story based NPC and typically offer much more complex logic in them and branching menu structures. These NPCs are typically used for quality of life and informational purposes, but may also incorporate kinks and sex into their repertoire.
Non exhaustive list of current NPCs in the Utility or Mixed Usage category. To download, open Bonfire's main menu and go to Mods -> NPC Manger, and click "Refresh." Find the NPC's name and click "Download."