Suggestions by @georgelippert

Donald Glover

as Renarin Kholin in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Henry Cavill

as Stennimar (lightsong) in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Jennifer Lawrence

as Vivenna in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Jason Momoa

as Vasher in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Wayne Brady

as Elhokar Kholin in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Taron Egerton

as Wayne in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Nolan North

as Nightblood in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Idris Elba

as Dalinar Kholin in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Nathan Fillion

as Waxillium Ladrian in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Cillian Murphy

as Hoid in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Keanu Reeves

as Szeth-son-son-Vallano in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Shohreh Aghdashloo

as Navani Kholin in Cosmere (stormlight, mistborn, elantris, warbraker, etc)

Anthony Hopkins

as Taravangian in Cosmere (stormlight, mistborn, elantris, warbraker, etc)