Berserker

Berserkers are powerful axe-wielding units that usually promote from Brigands or Pirates. They have high HP and Strength but low Defense, Skill and Speed (though they have greater speed than Generals). Also, they share a special characteristic: they have 15% extra Critical Hit ratings, just like Swordmasters and Trueblades. The first Berserkers were enemy-only and were basically Heroes with an alternate map sprite. Berserkers are they are now appeared in Fire_Emblem: Thracia_776 in which they were extremely powerful axe users with Wrath as a class skill but were enemy-only as Brigands promoted to Warrior in the game. Their first appearance as a playable class was in Fire Emblem: Fūin no Tsurugi.

In Fire Emblem: Rekka no Ken and Fire Emblem: The Sacred Stones, Pirates have to use an Ocean Seal to promote into Berserkers. In Fire Emblem: Path of Radiance, the class that promotes into Berserkers, Bandits, are enemy-only, but they can promote the very same way as any other unit (i.e. with a Master Seal or upon reaching Lv. 21)

Fūin no Tsurugi

 * Garret
 * Scott - Boss of Chapter 9
 * Gelero - Boss of Chapter 12x
 * Maggie - One of the bosses of Chapter 14
 * Rose - One of the bosses of Chapter 14

Rekka no Ken

 * Hawkeye - The protector of the Nabata Desert. (also has a unique animation)
 * Fargus
 * Georg

Sacred Stones

 * Dozla - a bodyguard of L'Arachel

Path of Radiance

 * Gashilama - a laguz slave trader and the boss of Chapter 14
 * Largo - the husband of Calill who loses an arm in a fight