Hero

A Hero is a special unit, typically a named historical or mythological figure. Heroes are not available in random-map games, but often appear in campaign scenarios and sometimes as "must-survive" heroes; that is, the game is lost if that unit is killed.

Age of Empires II
Starting with Age of Empires II: The Conquerors, heroes have the ability to regenerate and are immune to conversion.

Age of Mythology
In Age of Mythology, heroes are a core unit type and serve primarily as a counter to myth units.

Age of Empires III
In the Age of Empires III, the Explorer functions as a hero unit and it cannot be killed.

Non-Campaign

 * Brahmin
 * Daimyo
 * Explorer
 * Explorer Dog
 * Ikko-Ikki
 * Shaolin Master
 * Shogun Tokugawa
 * War Chief
 * Aztec War Chief
 * Iroquois War Chief
 * Sioux War Chief