Fire Emblem: Monshou no Nazo

Fire Emblem: Monshō no Nazo (Mystery of The Emblem) is the third Fire Emblem game, released on the Super Famicom. It is the sequel to the first Fire Emblem, which was remade and included in a compressed form as the first book in this game.

It has since received a remake for the Nintendo DS, Shin Monshō no Nazo.

Unused Classes
All of these have glitchy map sprites when inactive:
 * The Guardian: He looks very similar to a General, but wasn't programmed to use any weapons.
 * The Dark Knight: He is basically like a Social Knight (even borrowing its battle sprite) or Paladins. Perhaps it was meant to be a custom class for Camus.
 * The Sea Dragon: He has the ability to move freely on water just like Pirates. It borrows the battle sprites for the Fire Dragon.

Leftover Characters
Some characters from the first game have data but no portraits, such as Riff and Daros.

Unused Items

 * Silver Key
 * Dark Dragonstone
 * Ohm Fragment: A single-use item that resurrects its user when he is dead, in a series famous for having the fallen characters die irreversibly. It is non-functional.

Unused Text
Midia was originally an enemy character in Book 2. Maybe she was deceived by Hardin's lies just like the Wolf Knights:

"Heartless fiends who point their arrows at our holy kingdom, if you wish to step foot inside Akaneia Palace, then you'll have to kill me first!"