https://www.bungie.net/en/Armory/Detail?type=item&item=591060261&itemname=The%20Taikonaut
This pleases my long running fanboyism of classic Bungie stuffs.
Its not quite as bubbly in shape but its close enough for me!
http://www.halo-3-help.com/wp-content/uploads/2007/10/marathon.jpg
http://vignette1.wikia.nocookie.net/deadliestfiction/images/6/6c/Marinemarathon.jpg/revision/latest?cb=20120121020852
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Not to mention that it has a exotic perk that improves Rocket Launchers. I remember a gun from Marathon - the Spankr. It was in Halo as well. What do you think?