Undead

The undead are a race of humanoids who are essentially humans risen from the grave. They have green and blue hues of skin, skeletal joints and claws instead of fingernails. Lore wise, undead players are members of the Forsaken, a subsection of the undead, ruled by Sylvannas Windrunner, an undead High Elf who was slain and returned to life by the Lich King. They have hunched postures and appear haggard and tired.

I think that the Undead would be an interesting race to animate as they are different from the other 4 options, as well as not having any strong limitations or difficulties with the actor performing the animations.