Most npc were found sooner or later, the instruction are not too precise, but hopefully not too hard either, ask nicely on main if you need help, players are usually very helpful ^_^
The problem with those is string comparitors are not robust. If you're going to use that input method, please restrict the questions to numerical or one-word answers and make it absolutely clear what the format should be. I give you points for style, but this really could have been done better. "Difficult" I like, but "poorly implemented one-time-only quests" are something different.
Kroggles ensures the living stay living, and the dead stay dead.
Clobberella beats you up.
Teela Brown has a birdie!
Flosshilde communes with the very souls of the damned.
Walsung is actually pretty cool. For a guy made of metal.
I do believe pandora's npc stated to put all answers in lower case, and in the event of separators the questions state which separator to use (such as and). On top of that I made sure to put multiple answers in case people forgot to abide by the lower case rule.