Asgard and other new talismans - who is best for them?

I think LAD and Midgard are a pretty common combo.
Who are you putting Asgard, Yggdrasil, Niflheim, and even Metal on?
With limited time to play around with these I usually just pop them on an awakened or other more powerful character and they sit there unless i have to start swapping for a new Insanity dungeon.

Yggdrasil I've got on S banshee, Asgards im not using atm (but they work brilliantly on Gunner Minotaur but dont have it) , Nifs on Cosmic Lillith