The husband and wife in Hallowfall were pretty hilarious and relatable, but I think the last mage of Hallowfall hit me differently. Also the Hannir in Azj-Kahet were really intriguing to me.
Oh man my fav side quest was that alzheimer earthen in the isle of dorn oof hits hard my guy
It's hard for me to pick a favourite sidequest. All I can really say is this is probably the best worldbuilding a just-launched expansion has had.
This quest chain held up my Loremaster achievement for a couple of days. Thankfully it's finally resolved.