I was looking at the Halo Reach picture and I pointed out my thoughts about it here:
[url]http://i609.photobucket.com/albums/tt173/Alex_Mercy/haloreachnew.jpg[/url]
[Edited on 06.22.2009 6:13 PM PDT]
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I believe the one on the far left is a timetraveling half Elite half Human monster from the future, who came back in time to save Reach with his Flamethrower/Minigun weapon, that is ingrained in his tail.