The Anders/Avaline/Sebastian party in the Legacy dlc…also known as Team Everyone Is An Asshole To Each Other~
Runner up is a Fenris/Merrill/Anders mash up. To the surprise of literally nobody.
(Sebastian is such a dork in this though, I love it. Trying to peek at Varric’s notes and going “Nothing! Nothing!!!” when asked what he is doing. Gah I love him sfm)