Highlight the indicated character and press Plus to change them to the corresponding bonus character.

Kuuga: Highlight Gatack.
Agito: Highlight G3X.
Ryuki: Highlight Ryuga.
Blade: Highlight Autovaijin
Kabuto: Highlight Dark Kabuto.
Den-O: Highlight Nega Den-O.

Successfully complete Climax mode. Highlight the indicated character and press Plus to change them to the corresponding bonus character.

Hibiki: Highlight Worm.
Dark Decade : Highlight T-Rex Dopant.
Kiva: Highlight Gelnewt.
Diend: Highlight Magma Dopant.
IXA: Highlight Punch Hopper.