Successfully complete the indicated task in Witsuarunemitea Senki
to unlock the character. 
Note: This may only be done with newer patches of the game. 

Degukaba     - Complete Zone I.
Dii          - Complete H-Zone as Urutori.
Kanhordari   - Defeat Kanhordari in any 3-Zone stage as Dii.
Mitsumi-chan - Complete the game as Degukaba.
Mutsumi      - Complete G-Zone as Kamyu.
Niwe         - Complete F-Zone as Hakuoro.
Nuwangi      - Complete B-Zone as Eruru.
Origagan     - Defeat Origagan in any 2-Zone stage as Touka.
Sasante      - Complete C-Zone as Nuwangi. 
Suonkas      - Complete D-Zone as Karura.
Yuzuha       - Complete Zone-J.