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He IS a titan,can't be any other class.
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Actually his personality matches a Hunter's. both of them are based off of Clint Eastwood, they are both lone wolves, and they both prefer to be alone. Chief was one of the fastest Spartans, highest amount of luck, fast reflexes and a tendency to not trust others. Only similarities to Titans are his strength and his armor, which I could still debate. You can have Sam, but not John. He's ours.