Pause the game, select the "Extras" option, and choose the "Enter Code" selection.

Effect	Code
Abraham Lincoln	F3VG47
Cleopatra	P4YX22
Emmet (Clown)	FNHLTK
Emmet (Lizard)	UOOAQY
Emmet (Old West)	NIHX2B
Emmet (Pajamas)	HJ4C21
Gallant Guard	FXP9AN
Green Ninja	OSSVNI
Lady Liberty	A76DN7
Larry The Barista	K7TDXJ
Lord Vampyre	KGJ4DU
Mrs. Scratchen Post	UP7HJQ
Panda Guy	NG73OM
Prospector	FHNCD1
Robo SWAT (Laser)	GFH2F8
Shakespeare	31S3I5
Swamp Creature	BID12F
Vitruvious (Young)	BC2XJ5
Yeti	V4P96P