Conner - Henry Cavill,
Kurgan - Jason Momoa / Dave Bautista
Ramirez - Liam Neeson / Keanu Reeves
Brenda - Haylee Atwell / Eiza González
Heather - Emilia Clarke
Duncan - Sam Worthington
Watcher - Christopher Lambert
How about Dolph Lundgren as The Kurgan? The man is 6'5" and has an accent already? Sure he is old.
I have another idea none may have considered, why not Peter Stormare as The Kurgan? The guy is great and plays villains well.
this is missing actors but still interesting to look at:
https://tallestactor.com/wp-content/uploads/2013/11/Tallest_Actor-Wide-Image-All-Actors.png
It would be great of Clancy Brown had a small role, not as an immortal, but maybe a reporter or cop.
shareConner - Michael B Jordan
Kurgan - Amy Schumer
Ramirez - Tilda Swinton
Brenda - Tessa Thompson
Heather - Anya Taylor Joy