Unlockable Battle Maps Characters
Every time you beat the game you unlock a new battle maps secret character. There are 8 different characters unlockable.

Guinivere (Zephyr's Sister) Class: Sage Beat the game eight times
Eliwood (From Fire Emlbem 7) Class: Paldin Beat the game five times
Brenya (Boss of Chapter 21) Class: General Beat the game four times
Narshen (Boss of Chapter 16) Class: Dragon Master Beat the game once
Zephyr (Boss of Chapter 22!!!) Class: King Beat the game seven times
Mardocus (Boss of Chapter 23) Class: Sage Beat the game six times
Hector (From Fire Emblem 7) Class: General Beat the game three times
Gale (Dragon Master on Chapter 21) Class: Dragon Master Beat the game twice