Complete extra maps in postgame, and you can earn new allies. The extra maps are unlocked by passing bills in the Senate.
Meet the following requirements to view extra endings.
Do the following to unlock Chara World.
In Episode 4, you will unlock the Legendary Tree bill. Pass it in the Senate to gain a new evil symbol. This is a strange and unique symbol, as it allows you to setup a "family tree" of sorts for the symbol's leader. One use for it is to unlock epilogues (See Endings cheat.), but its primary purpose is to grant special effects to the leader by setting relationships. Normally, you lose these effects when a member is removed from the symbol's area of effect, but there are ways of making the relationships and their effects permanent.
Defeat the following pirate groups that appear in the Item World to get these parts.About the Commando Pirates: on the first set of floors, take either gate on Floor 5 and then the other gate on Floor 10 (Item gate on floor 5, Innocent gate on floor 10). then, go down either route as normal.
The following is a list of them items rewarded for completing stages in the X-Dimension.