NPC stands for Non-player character, and is not involved in activites that player characters (PC) are involved in. An NPC usually looks like other characters in the game, but is controlled by the computer. Often NPCs are responsible for quest distribution or as a vendor or merchant to players in game to both sell items to, or buy items from.
You'll be able to interact with Non Player Characters (NPCs) throughout the game. Most of them will have quests for you to do, others are creatures or objects you need to interact with to complete a quest.
If a new quest is available, a blue "!" mark will appear about their head. A golden "?" mark will appear if that NPC is the target or destination of a quest.
Ones with a purple circular arrow icon means they have a repeatable quest which you can do over and over again. Use the Region Map (m) to see available quests, quest targets, and all NPCs in the area.
Some quests have a narrow level requirements so be sure to finish your quests quickly!
Shop or Crafting NPCs are NPCs that provide items that you can either buy or craft. The ones located within the School Areas (up to Sunset Pier or James Isle) are school specific and will refuse business with anyone of the other school.
Social Vendor Reed (School Grounds)
This former student sells items you can't get at the regular shops with currency no one else accepts. A bit shady, yes.
Trade complimentary scrolls (from completing quests) for accessories and Social Points for special titles, marbles, gems, fabrics, and crystals.
Brilliant, and a little bit mad, he once made a helicopter out of an anti-gravity Marble, CPU fan, and a baby carriage.
Talk to him to craft special gear like capes, gear sets, and marbles that add effects to your weapons.
A man of few words, but much carpentering. Suspected to be related to Dr. Chow... a similarity about the nose perhaps?