McDonnell, Cain

カイン・マクダネル

He serves as the leader of the Super Five Field Guardians. Initially, he feigns being a good guy to Yamato, but it is later revealed that this was a ruse intended to destroy Cobalt Blade. Cain subsequently joins the Neo Shadow Alliance alongside Joshua. During the final battle against the Neo Shadow Alliance, Cain is defeated by Grey. His B-Daman, Knight Cavalry, is later destroyed and replaced with Black Knight, and then again replaced with Lord Cavalry. His horrific past, having been raised by his father, might be the primary reason for his turn to evil. Although little is heard about his mother, it is implied that she has died, further contributing to Cain's downfall and emotional fragmentation.
After successfully destroying Yamato's beloved B-Daman, Cobalt Blade, Cain reveals his evil nature and vows to destroy Yamato and his friends the next time they meet. Cain later joins the Neo Shadow Alliance with Joshua following Yamato's defeat.
As hinted, Yamato and his friends encounter Cain again; however, it is Grey who chooses to fight him, resulting in the loss of his B-Daman, Chrome Zephyr. All seems lost until Master Armada provides Grey with a new B-Daman, Chrome Raven.
In the final battle against the Neo Shadow Alliance, Cain is successfully defeated by Grey. At the end of the season, Cain and Joshua are seen witnessing the snowfall of B-Daman souls on a cliff. Cain, with eyes dulled by his disillusionment and confined to a wheelchair, reflects on his state. Upon reaching out a hand, a single soul falls into it. His eyes regain their color as he realizes Yamato has triumphed over Marda B. He is last seen being wheeled away with Joshua, presumably to return home and start anew.