Elf

Elves, in some form or another, have made numerous appearences in the StarCraft series, usually as jokes.

Twelve Days of StarCraft is a holiday game, named as such by Santa Claus and his elves.

The Night Elf Banshee is avaliable as a player portrait in Wings of Liberty, with night elves being a race from Warcraft. A holographic figure in the Hyperion's cantina also does the night elf dance. Concept art once deviced the merc compound hosting a similar hologram of an actual night elf.

Sylvanas is a high elf.