Milanor .... From the start

Yggdra .... From the start

Durant .... Rescue by standing beside him in BF3

Nietzsche .... In BF6, go down 2 squares from Durant's location to unlock the hidden map. Then enter the town 3 squares to the right, and Nietzsche will join equipped with the Coral Spear. After clearing the BF, Nietzsche will join but will not have a Coral Spear. to you.

Rosary .... Defeat Roswell in BF10 and she joins in BF11B

Roswell .... Defeat Rosary in BF10 and he joins in BF11A

Russell .... Defeat Aegina and clear BF20, then you can rescue Russell in BF21

Cruz .... Rescue him in BF23.5 (a hidden level)

Elena .... Start of BF27