All some pretty sweet names, but I'm not sure another class is necessary. I'd rather see a progression of the current classes. What if you could evolve your Hunter/Titan/Warlock and start blending subclasses? Tether with throwing knife and blink strike could be fun. Or not; you get the idea. Obviously things would need to be scaled and tweaked to avoid OP configurations, but this is far more appealing to me than a fourth character I need to manage.