Blocks

Blocks (ブロックス Burokkusu) 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, including a dinosaur, a tank, and a large bird.

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

O.S. Die Block
O.S. Die Block (O.S. 組換自在塊 (DIE·BLOCK)
 * 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. DIE (ダイ)·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. Die Bird
 * 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 don't appear in the anime series directly, however, in the end, Brocken is shown using his Die Block O.S. form.