The 300 members of the Hetairoi or Companions are always by the Emperor's side, guarding his person during the Great Crusade and His later internment in the Golden Throne, They are an elite within the Custodian Guard, legendary fighters that stand out like gems amonst the golden ranks of their brethren. In 30k you can customize them a bit s I've given them different weapons.
Shaka Mali is equipped with an ornate guardian spear and praesidium shield
Aurelian Odeanatus wields a solerite talon
Carolus Friedrich is armed with parangon blade