Blocks

Blocks (ブロックス) are the guardian ghosts of Brocken Meyer.

About
Brocken Meyer's guardian ghosts are a pack of rats that he Over Souls in his building block pieces. Using the blocks, he can create many kinds of constructs for combat, collectively called O.S. Die Block (OS).

Attached to his Lego body, the blocks also serve as prosthetics for his removed limbs.

O.S. Die Saurus
O.S. Die Saurus (O.S. ·ザウルス Dai Zaurus)
 * Shaman: Brocken Meyer
 * O.S. Type: Spirit Type
 * Spirit Ally(s): Rat Spirits
 * Medium: Hao Blocks

Description: Using the many Hao Blocks at his disposal, Brocken Meyer creates a giant Tyrannosaurus rex, where his own body is attached to the middle of the T-Rex's chest.

O.S. Die Tank
O.S. Die Tank (O.S. ·タンク Dai Tanku)
 * Shaman: Brocken Meyer
 * O.S. Type: Spirit Type
 * Spirit Ally(s): Rat Spirits
 * Medium: Hao Blocks

Description: Using the many Hao Blocks at his disposal, Brocken Meyer creates a tank which he himself drives like a normal chauffeur.

O.S. Die Bird
O.S. Block Bird (OS ブロックバード Burokku Bādo)
 * Shaman: Brocken Meyer
 * O.S. Type: Spirit Type
 * Spirit Ally(s): Rat Spirits
 * Medium: Hao Blocks

Description: Using the many Hao Blocks at his disposal, Brocken Meyer creates a large bird. This Over Soul has mainly been seen used as a means of transportation.

Anime/Manga Difference
His spirits do not appear in the 2001 anime series directly; however, in the end, Brocken is shown using his Die Block O.S. form.