Rhombus

Rhombus was the head paladin of the Brotherhood of Steel. He's not one for conversations and if angered him, Rhombus would kick the Vault Dweller out of the Brotherhood of Steel. He promises to train the Vault Dweller once the mutant threat is removed, we don't know if he ever does.

He was voiced by Clancy Brown

Tell Me About
You can ask Rhombus about the following words:
 * Vree
 * Rhombus
 * Talus
 * Elder
 * Scribes
 * Knights
 * Hub
 * Disks
 * Army
 * Boneyard
 * Paladins
 * Master
 * War
 * Exodus
 * Strange Army
 * Merchants
 * Missing Caravans
 * Children of the Cathedral
 * Initiates
 * Chip

Alternate history
In one of the endings for the Brotherhood of Steel in Fallout 1, it is said that in the 2180s the Brotherhood, now called the Steel Plague, devastated the newly formed NCR and started a Dark Age that could last a thousand years. This ending is, however, not part of the canon Fallout background. The image for this ending shows the elderly Rhombus and indicates he is the new iron-fisted leader of the Brotherhood.

Rhombus in Fallout Games
Rhombus appeared in the first Fallout game. He was an unlockable playable character in the Fallout: Brotherhood of Steel game.