These are awesome ideas. Great job. I didn't think there could be a way to add/build on the current subclasses without borrowing (grenades from one class used on another). The only thing that i think could top this would be to have a fully customizable Guardian. Any perk,jump,melee,nade,or super. Obtained by completing specific tasks in PvE and PvP with your current subclasses to unlock a customizable subclass node until you complete your new custom Guardian.