Marda B is the primary antagonist of Battle B-Daman.
|Marda B and his entity Biarce|
|English Voice Actor||Paul St. Peter|
|Eyes||Black and Yellow|
|Occupation||Creator of the Neo Shadow Alliance|
|Non Battle Character|
- It mentioned by Pandoro that Marda-B lived in ancient times so Marda-B might be over a thousand years old.
Marda B first existed as the greatest B-Da Player the B-Da World had ever seen. He then wished to gain eternal from the B-Spirits but instead his true self was sealed inside a feline statue and the side of him that wanted nothing but victory became the spirit known as Marda B.
Marda B debuted when Ababa tells him that Cobalt Blade had been destroyed by Cain McDonnell higly upsetting him. He is next seen when Enjyu prepared to face Yamato in the IBA Winners Tournament Championship. He revealed himself to be the creator of the Shadow Alliance. Marda B created Blazing Kahn to help Enjyu defeat Yamato but instead Enjyu betrayed them and lost the championship.
Marda B is shown to have the power to both control and empower B-Da Players or even both at the same time shown when he did so to News and Salz to capture Cobalt Saber. After News and Salz were defeated he disbanded the Shadow Alliance and created the Neo Shadow Alliance in it place. Marda B hypnotized several B-Da Players to collect B-Da spirits from hundreds of B-Da Players. Players he hypnotized include Castieo (Ike), Manual, Fin Junior, Shegen and the servants of Pandoro.
After all of their defeats he decides to launch his plan to conquer the B-Da World. Marda B commences his plan and takes over the entire B-Da World. Before he could destroy the world he is halted by Yamato Delgado, Terry McScotty, Wen Yong Fa and Grey Michael Vincent. It is discovered that Marda B's weakness are the B-Energies created by his true (good) self.
Before his final battle with Yamato, Marda B reveals that Biarce is his entity also known as the body he needs to battle. Marda B then combines with Biarce to create Marda Biarce. During the battle between Marda Biarce and Yamato, it is revealed that Marda B created the Shadow Alliance and Neo Shadow Alliance just to have the ultimate B-Da Battle with Yamato. After Marda Biarce is defeated, the good side of Marda B is revealed as a gray cat with yellow eyes.