Elite (My personal choice, Elites are very cool aliens).
Human (117 is a human. That should draw in some votes.)
Grunt (Sometimes comical, "Aggh! The Demon." Lol.
Flood (These are little parasites, witch dig under your skin and make you a... MONSTER! Ohhhhhh!* *That the sound a ghost makes).
Forerunners (Mysterious, advanced aliens. They built those big rings, extinct though)
Hunters (Big things with shields, they are quite... big)
Precursors (They are like the forerunners and around at the same time but badass!)
bacon stripes yummy things
Jackal (I doubt anyone will vote for Jackal, there ugly little things. But we all have opinions).
Buggers (Flying bugs. Annoying.)
Brute (Those big spaz creatures, you know the ones with Hammers).
Prophets (The Prophets wanted to wipe out humanity. Bastards.)