I’d say either:
Euryali (useful for its colors)
Scorpius (stat buff is useful)
Skadi (bue perma storm has potential use)
Stonehammer (9 star kingdom for tributes)
Xathanos (no other way to get it)
Yasmine’s Chosen (sometimes its good)
Doomclaw and Jotnar are going to be in event chest soon/soonish, otherwise I’d suggest Jotnar has value.