I'm pretty sure he's already an established character. Not an odst.
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He is, he appeared in Halo 4 and Unto Dawn, but we could have a story of how he tried to be an ODST, but couldn't because of cryosleep issues. We could have a deep story.
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Cryosleep issues?
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Remember Unto Dawn?
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Not really, but he must have gotten over them, as he's now serving on long term missions aboard the infinity
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Well, we could have an origin story of him getting over them and rising through the ranks.
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I suppose