[True_Moose]

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If you romance Viconia, she gets kidnapped by Bodhi. Goes for all romances though, so doesn't really count.

So according to u, Illumina then neither Valygar, Aerie or Haer'Dalis really have quests attached to them. That's definitely true in the gaming sense, but each have RPing value. Valygar (PS) learns of his past, Aerie (AP) finally outgrows the shadow of Quayle and Haer'Dalis (AP) grows away from his play.
Of course you need SOME form of Valygar for the PS quest, so it doesn't really count.

Anyway, I never picked up any NPC specifically for their quest. I think its better RPing to get a tight group together, and their quests are just the icing on the cake.