Bungie has been talking about how they want us to develop a character over time. To make it us. However since their are three class', we would end up missing out on a lot of gameplay styles since we can only play as one class at a time.
One solution would be to have multiple characters that are all you, that way we could experience all the varieties of gameplay. Good idea? Bad idea? You decide.
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(This is considering factions are joinable) So long as they all have to remain in the same faction, I'm fine with it. Don't want a bunch of turncoats leaking info to the opposing faction in Faction Wars!