Minifigures. These are the brickish constructible figures that come in toy brick sets. They have three parts (head, a torso, and legs) connected at two joints (hips and neck). In BMotU, these are notminiatures representing people – they are the minifig guys (and gals) themselves.
Another whimsical way to play an RPGwith toy bricks…, from M. Martin Costa
Download (free pdf): Brickmasters of the Unknown8