To me a lot of them are synonymous with the current ones...adept, shaman, etc are warlocks. Sentinel and the like are Titans. The only unique one is engineer. That gets my vote for this survey.
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Engineer's super could buff armors and weapons.
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That's what a Titan's bubble does.
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Thinking along the lines of adding perks and damage buffs.
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I like it. Id make an engineer.