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Cain McDonnell (カイン・マクダネル)Age: 13
Birthday: February 26
Height: 162 cm (5'3")
Weight: 45 kg (99 lbs)
Blood type: AB
He is the leader of the Super Five Field Guardians. At first, he pretends to be a good guy to Yamato, but it was later learned that this was a trick in order to destroy Cobalt Blade. Cain later joined the Neo Shadow Alliance with Joshua. In the final battle against the Neo Shadow Alliance Cain, he was defeated by Grey. His B-Daman is Knight Cavalry which later destroyed and replaced with Black Knight, and then again replaced with Lord Cavalry.His horrific past being raised up by his father might be the main reason why he turned evil. Though we do not hear much of his mother, it is implied that she has died, furthering Cain's downfall and emotional fragmentation.
After successfully destroying Yamato's beloved B'daman, Cobalt Blade, Cain shows his evil shades and vows to destroy him and his friends the next time they meet. Cain later joined the Neo Shadow Alliance with Joshua after Yamato's defeat.
As hinted, Yamato and his friends ran into Cain again, however it was Grey who chose to fight him, resulting in the loss of his B'daman, Chrome Zephyr. All seemed lost until Master Armada brought Grey a new B'daman, Chrome Raven.
In the final battle against the Neo Shadow Alliance Cain, he was 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 from his disillusionment and bound to a wheelchair, reflects on his disillusionment. Upon reaching a hand out, a single soul falls into it. His eyes fill with color again, realizing Yamato had triumphed over Marda B. He is last seen being wheeled off with Joshua, presumably to return home and start anew.