Umm.. Are we forgetting what happens in the ride itself?
"Imagination is a thing to be captured and studied..." is essentially Channing's opinion. We learn this after the second lab. I dont recall the exact phrase, so please don't hound me on it.
Anyways, Figment is running free, as the imagination ought to be, despite Channing's attempts to force him into an orderly state.
Figment is of Channings imagination. Channing tries to ignore him but eventually he breaks free and does what he wants.
Channing, at the end, is much happier for it. So, Figment was doing what he had to do in order to get the point across to Channing, who obviously got it all wrong, as seen in the previous remake.
Remember, Figment is the embodiement of imagination, or atleast the notion of it. Hence, his likeness in his own home would suggest a home full of imagination to explore. Not his own self-love, but rather a million other Figments waiting to be explored just like him.
Figment is a singular character, but the repsentation of a plural idea.
As said before, Dreamfinder gave his Figment childish delight.
-Rob