Information is the basis for the majority of all growth in characters. With sufficient influence any sort of information can be acquired after buying. Even a Kage's biography can be made publicly available. Puppets and Robots
Most people want to live in a safe village. There's many views on what's most safe or too much. The majority of things made here are maintained by NPC. For defenses villages will be edited for people to clearly see OOC so their IC can. Common Items
Common items are basic items that don't require registration. Common items are also items that don't fit in other categories and are rarely seen. Armor/poison/medicine for example. Weapons
Meaningful use of NPC for temporary or permanent purposes is possible. Their weight is as heavy as bijuu and you should track their journey when using.