Throwing a clue out there to clear things up... the NPC is associated with more than one quest. This is why the majority of your questions that said "the quest" were yes and no.
RECAP YES an NPC an NPC you would likely kill Part of a quest Existed prior to Underfoot Quest related to NPC is from PoP or earlier Quest involves more than one zone NPC is unique Are there more than 2 zones involved Quest results in something a player would equip Any of the zones city zones Are any of the zones home cities Giver of the quests (he can be) Existed prior to Velious quests have anything to do with permissions for or acquisition of trades skills materials Is there something that unites the tasks other than the NPC is part of them (at least I think so if I understand the question right) NO Flagged as a rare creature Kill the NPC as part of the quest Newer quest set in an older zone Can wear a visible hat (they don't but I didnt hand one in to see what happens either) Is the NPC in every zone of the quest Seasonal quest Priest of Discord Found in a home city YES/NO Quest benefits one class most Quest related to this NPC available in Velious or before NPC act as a "report to" in the quest Is the quest set in original EQ
One of them, definitely not. The other, sure. Someone else can jump in... Grove is doing all the heavy lifting, but don't let that deter anyone.