Just input the codes in the 2nd choice of extra mode to unlocked them.

Code	Effect
KBAFLFHICAJTKMIY	Unlocked Alicia Gunther (from the TV anime)
TKBHCNBERHRKJNFG	Unlocked Edy's Detachment (includes all 6 of her squad)
LITSGAAMEORFRCRQ	Unlocked Lamar/Ramal
KNWRJRGSMLASTNSQ	Unlocked Landzaat Farudio
CKRJWNSXTYMNGZRT	Unlocked Mintz (from Valkyria: Wish Your Smile)
KSNEGA56LPY7CTQ9	Unlocked Selvaria