I think it would add to the lore of the world if undead, like conjurations, got bonus streams based on race, and not just class. While not many characters would encounter this, I think it'd be nifty if the default wasn't always zombie.
Wights for snow goblins, frost half giants
Drowned for all the amphibious races
Vampires for vampires
Racial ghosts for dwarves and other ancestry-focused races
Wraiths for fey and shadow races, ect.