A comprehensive guild to role playing with NPCs

NPC use on the ROIAF sim falls into five major categories: 1) Player Controlled, 2) Story Team Request, 3) WBS Move, 4) Integrity System, and 5) NPCing Actual Players. This guide is intended to help players figure out when to use which. It’s fairly simple and the majority of cases should be obvious, but if it is ever not, feel free to ask an admin for clarification!
1) Player Controlled
This is the simplest and by far the most common category. These player controlled NPCs are personal guards (limited to 2 personal guards per player - exceptions can be made on a case by case basis and should be requested from the admin), servants, handmaidens, septas, squires, tavern keepers, fish mongers, and even younger children not "of age", etc. The list is not limited to all of the possibilities that exist under this umbrella. The majority of NPCs can be freely RPed by players to add flavor to their RP scene. 
Example: Lady Grafton has 2 guards and a septa and goes to the dock to purchase some fish from a fish monger. In this instance, both guards, the septa, and the fish monger would all be player controlled npcs.
Limitations: NPCs can’t be used in this fashion for offensive actions, unless your character is an IC authority in the area. 
Lord Tully could order Riverlands consulate guards to seize someone in the consulate, but a Stormlander visitor couldn’t. If you believe NPCs should take action but your character does not have the authority to order it, you may ask the IC/OOC leads for the region (or an admin, if neither of those are applicable) what the guards would do in the situation.
2) Story Team Request
If you wish to correspond with important NPCs (Lords and Ladies not in King’s Landing, family back home, the Citadel, members of the Faith that aren’t played, etc), do so via the Story Team Requests - click here: http://kl-sl.com/Applications/Submit-a-Story-Team-Request Simply select the “Letter to an NPC” category and then write an IC letter to the person you wish to communicate with. The Story Team will get back to you with a response letter. This is the only way to get NPC actions from important NPCs (like ruling Lords). All Story Team Requests are held in confidentiality, are only accessible to admin in the Story Team, and by submitting them online we are able to keep the information centrally located and reference past letters in the future to maintain consistency in storylines and relationships exchanged in letters.
3) WBS Move
If the NPCs you wish to use are soldiers and the action you wish them to take is something military in nature (moving soldiers from one place to another, attacking a city, sending out recruiters to try and secure a mercenary contract, ordering ships built, etc.), then they require a WBS move. It is important to remember, ICly, that in order to move troops, players should also consult their LPs for their region first or face consequences ICC. For a guide on how to submit WBS moves, please click here: http://kl-sl.com/Applications/WBS-Submission
4) Integrity System
If you wish to use NPCs to take an anonymous hostile action against a character (thugs to mug, kidnap, or pickpocket someone, etc.), contact an admin about doing an integrity system move. The admin team will be happy to walk you through anything that needs doing on that front. For an overview of the Integrity System, please click here: http://kl-sl.com/Community-Forums/g/posts/t/289/Presentation--Proposal-Integrity-System
5) NPCing Player Characters
Player characters can only be NPCed with express permission from the player in question. This NPCing should be kept vague and minimal, to avoid any potential issues. While everyone loves detailed posts, when NPCing a player character please keep posts as neutral and as short as possible, to avoid any potential issues. Additionally, NPCed player characters can’t be used to agree or disagree with propositions, trade agreements, or anything else that might affect the character long term without express permission from the player in question. Players are generally encouraged not to engage NPC players with conversation, suggesting emotions or feelings the NPC player would have, or suggest how that player would react to situations. Instead, we encourage players to allude to the NPC player being "present" in the scene, in attendance, but resist from giving them full dialogue or emotion. 
Example: "Lord Beesbury said his goodnights and proceeded upstairs” rather than giving specific dialogue or being overly flowery in the descriptions.