Story:

Phantom is a ghost (supposedly) who is forever bound to the Antagonist. When the JuiceVerse was first created, he was inserted into is along with Antag. He enjoys causing problems for other people, usually because he thinks it's funny (sometimes it is). He also likes to tell the same joke 62 times in a row, which isn't funny (sometimes it is).

Before the events of Finale D'Objet, he is contained in a cage by Antag, unable to escape through normal means. Unfortunately, the cage wasn't designed to resist its contents expanding.

Phantom can't expand.

He does, however, have a cloning machine, so he constantly tries to clone himself so that the cage collapses and he can be free. Antag simply just stuck his clones in cards and sold them to travelers passing by, but Phantom was onto something. If he could keep it up, he'd be out of there in no time. He just had to wait...