Does he have PTVD caused by some horrifying experience in battle or even something involving family deaths? Or do you think he just prefers not to talk? If so, then why does he prefer not to talk? Anti-Social? Let's hear some possibilities. Be creative.
[Edited on 08.29.2011 10:29 AM PDT]
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The Rookie is really Gordon Freeman in an ODST suit, after all his trials in Half Life 1 and 2, Gordon Freeman struggled for work so to provide for his family, he took up auditions to star in the Halo franchise... Due to his popularity in Valve's game though, Bungie did not want law suits so they made him wear an ODST outfit to hide his face. [Edited on 07.09.2012 2:28 PM PDT]