To unlock the following Protaganist Bakugans, first complete Story mode. Then, perform the corresponding tasks:
PROTAGANIST BAKUGAN - HOW TO UNLOCK Cycloid - Join Julie in a Tag Team battle. Dragonoid - Defeat Dan in a One On One battle. Fortress - Join Dan in a Tag Team battle. Gorem - Defeat Julie in a One On One battle. Harpus - Join Shun in a Tag Team battle. Preyas - Defeat Marucho in a One On One battle. Sirenoid - Join Marucho in a Tag Team battle. Skyress - Defeat Shun in a One On One battle. Tentacler - Join Runo in a Tag Team battle. Tigrerra - Defeat Runo in One On One battle.